An error occurred while sending email

An error occurred while sending email

This error message is an ongoing problem with Thunderbird Beta. Sometimes when I try to send an email there is a couple minute delay before the message is actually sent and the message is not copied into my Sent folder, but rather it is copied into a local folder and not onto the server. The IP and I determined there is not a problem with the main server because I can send and receive test messages to myself on the IP web mail page. The issue is getting worse in recent days.

Chosen solution

being able to send messages to yourself using web mail is a bit like walking out to the street and putting a letter in your own mail box, as oposed to going to a post box and posting it. It proves nothing at all other than the providers web server works. It is not even vaguely related to email.

Unfortunately it is also the standard of email or technical support you can expect from those 24/7 support lines ISP’s offer. The folk answering are after all the lowest paid sub contracts the ISP can find.

Usually when I hear of error messages like «The server responded service not available. Closing transmission channel.» it means one of two things.

1. The account is not configured correctly to contact the server. This usually occurs when the provider doe some sort of upgrade to their service and you have not made the changes they requested. To that end.

Please add the troubleshooting information to your post To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box «Include account names»!
• Paste this in your post.

2. You are using a VPN and the providers server is programs to not allow connections to send mail unless you use the ISPS network to connect, the VPN effectively hiding you connection point from the mail server.

Chosen Solution

being able to send messages to yourself using web mail is a bit like walking out to the street and putting a letter in your own mail box, as oposed to going to a post box and posting it. It proves nothing at all other than the providers web server works. It is not even vaguely related to email.

Unfortunately it is also the standard of email or technical support you can expect from those 24/7 support lines ISP’s offer. The folk answering are after all the lowest paid sub contracts the ISP can find.

Usually when I hear of error messages like «The server responded service not available. Closing transmission channel.» it means one of two things.

1. The account is not configured correctly to contact the server. This usually occurs when the provider doe some sort of upgrade to their service and you have not made the changes they requested. To that end.

Please add the troubleshooting information to your post To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box «Include account names»!
• Paste this in your post.

2. You are using a VPN and the providers server is programs to not allow connections to send mail unless you use the ISPS network to connect, the VPN effectively hiding you connection point from the mail server.

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An error occurred while sending email

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can’t send mails. error message: An error occurred while sending mail. The mail server responded: 5.7.1 Recipient address rejected: Authentication required.

• 4 replies
• 10 have this problem
• 502 views
• Last reply by martindale

thunderbird issue — can send mails fine from webmail, but not from Thunderbird. It’s blocking all outgoing messages, and giving the error message: An error occurred while sending mail. The mail server responded: 5.7.1 Recipient address rejected: Authentication required.

started suddenly — was working fine a couple of days ago. Any ideas?

Chosen solution

Sending from webmail does not use SMTP server so trying to compare the 2 is meaningless. You need to find out what the correct SMTP server settings for your provider and make any needed changes. Wild guess is the authentication settings need updating.

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An error occurred while sending email

This message appears upon trying to send just one message. Other messages go out fine. The number of recipients is not any greater than for any other message I’ve sent over the years, and there isn’t even an attachment involved. I’ve checked the list of recipients to ensure that the email nomenclature is correct, and it is. I have saved this message and continue to have no problem with anything else I’m sending. Finally, it says, «Please check the message and try again.» I have no idea what I’m supposed to be looking for when I «check the message.» It is just text, like any other simple message, with no hidden codes or anything else, assuming I could even insert hidden codes. In many years of using Thunderbird this has never happened before. Maybe it’s something simple, like chewing gum and walking backwards at the same time. What can you tell me?

Chosen solution

An error occurred while sending mail. The mail server responded: 6.6.0 Error sending message for delivery.. Please check the message and try again.

I tried adding my email as to and the rest bcc and it worked. This is on a win10 system — my old win7 laptop has no problems.

Well we do have something of a quandary here.

Mail status codes such as you have posted are in the form X.Y.Z

so in your case the 6 value is out of the approved range by the standard for an email error. RFC3463 describes the first digit (The X part )as;

Your value of 6 is just not defined. So I think we need as much information as you can provider about your provider. Like who it is and what the SMTP server you are using is named.

By inference I am thinking that the 6 is something invented by the sever software authors and may translate to the on forwarding part of the process. But even if that is the case the generic second digit (The Y digit) offers a fairly generic error literal. X.6.XXX Message Content or Media Status

The message content or media status codes report failures involving the content of the message. These codes report failures due to translation, transcoding, or otherwise unsupported message media. Message content or media issues are under the control of both the sender and the receiver, both of which must support a common set of supported content-types.

Hence my request for more information about the provider. While searching I did encounter a reference on a SKY mail forum about the Yahoo policy of not allowing mail without a To entry to send. The error given there is 554 6.6.0 Error sending message for delivery.

Is that your issue perhaps.

The message content or media status codes report failures involving the content of the message. These codes report failures due to translation, transcoding, or otherwise unsupported message media. Message content or media issues are under the control of both the sender and the receiver, both of which must support a common set of supported content-types.

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An error occurred while sending email

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I cannot send an email with Thunderbird

• 6 replies
• 2 have this problem
• 16 views
• Last reply by KevinCom

I get the following error message when trying to send an email as of this morning.

«An error occurred while sending mail. The mail server responded: 5.1.0 Authentication required. Please verify that your email address is correct in your account»

Chosen solution

Your setting — Authentication method = No Authentication

Should be normal password.

What are you using for SMTP settings? It sounds like they are not right.

Description: Comcast Server Name: smtp.comcast.net port: 465 User Name: Authentication method: No authentication connection security: SSL/TLS

Chosen Solution

Your setting — Authentication method = No Authentication

Should be normal password.

Thank you, it did fix it, I don’t know why or how it got changed, it worked fine yesterday.

Unfortunately everything you read on the Internet is not true.

This is from Comcast page.

The provider configures their servers and should have the most up to date info. I happen to use Comcast so i know what they are looking for. Keep in mind that Thunderbird is a volunteer operation and some documentations is slow to be updated.

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An error occurred while sending email

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An error occurred while sending mail. The mail server responded: 5.3.4 554-554 5.2.0 STOREDRV.Deliver; delivery result banner. Please check the message and try

• 10 replies
• 1 has this problem
• 253 views
• Last reply by janisw

An error occurred while sending mail. The mail server responded: 5.3.4 554-554 5.2.0 STOREDRV.Deliver; delivery result banner. Please check the message and try again.

sending an email to with an attachment to an email list in a csv file. Also found that sending anemail to an individual email address without an attachment also failed.

Chosen solution

so I finally heard from microsoft and hot mail does not allow emails to more than 10 persons at a time.

sounds like a cop out to me.

Talk to your email provider. The error is from their server.

the service provider says this is not a problem at the server and we verified this by sending from another email client.

As 534 indicates a security problem when logging in, you could check password and security-settings.

EDIT You should also check that your firewall allows T-bird (version?) to communicate

Modified March 8, 2016 at 12:43:28 PM PST by Gnospen

I don’t see any certificates or special info in the security tab. i can’t find anywhere in thunderbird to check the password.

tools / options / security / passwords / saved passwords and show passwords

okay found the passwords list and the password is correct. looked int he list of allowed apps in the windows 10 firewall. don’t know what app I am looking for there to check if thunderbird is allowed.

individual emails are going through but an email with a merged list or 52 email addresses is not going through although it shows up in the sent folder. Also shows up twice in the sent folder.

email with a merged list or 52 email addresses is not going through

You may have hit a limit imposed by your email provider. Talk to them.

Also shows up twice in the sent folder.

In Thunderbird account settings you can tell Thunderbird not to place a copy of sent messages to the Sent folder.

email with a merged list or 52 email addresses is not going through

Also shows up twice in the sent folder.

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being able to send messages to yourself using web mail is a bit like walking out to the street and putting a letter in your own mail box, as oposed to going to a post box and posting it. It proves nothing at all other than the providers web server works. It is not even vaguely related to email.

Unfortunately it is also the standard of email or technical support you can expect from those 24/7 support lines ISP’s offer. The folk answering are after all the lowest paid sub contracts the ISP can find.

Usually when I hear of error messages like «The server responded service not available. Closing transmission channel.» it means one of two things.

1. The account is not configured correctly to contact the server. This usually occurs when the provider doe some sort of upgrade to their service and you have not made the changes they requested. To that end.

Please add the troubleshooting information to your post
To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box «Include account names»!
• Paste this in your post.

2. You are using a VPN and the providers server is programs to not allow connections to send mail unless you use the ISPS network to connect, the VPN effectively hiding you connection point from the mail server.

This article was written for Thunderbird but also applies to Mozilla Suite / SeaMonkey (though some menu sequences may differ).

This article lists the error messages that you might see when you try to connect to an SMTP server to send mail. For each error message it identifies possible causes. For troubleshooting techniques, see: Cannot send mail

Some of these error messages are misleading. In particular, the «Please verify…» part of these messages is rarely helpful. The messages are long, making some of them look very similar. When you are troubleshooting, be careful to identify the error message exactly.

Sending mail to the SMTP server happens in stages. Different things can go wrong at each stage, so each stage has different error messages.

When a connection fails, Thunderbird provides you with up to four pieces of information about the failure. If you have to ask for support (for example, in a forum or from a helpdesk), ensure that you provide all the information:

• The status message in Thunderbird’s status bar and in the Sending Messages window. This tells you the stage that Thunderbird reached when the error occurred.
• An error summary provided by Thunderbird. This is almost always: «Sending of message failed»
• The detailed error message provided by Thunderbird. This is often misleading.
• An embedded message from the server. Thunderbird includes this in its error message.

Note:  If an error message shows the server name as «localhost», it usually means that you are using a webmail extension or an anti-virus program. In this case the error might be coming from that program, not from the SMTP server.

Thunderbird errors

This section lists the stages that Thunderbird goes through when it connects to an SMTP server to send a message, and it lists the possible error messages for each stage.

Lookup

Thunderbird looks up the SMTP server’s name to find its network address (IP address). The lookup service (DNS) is usually provided by your ISP as part of your Internet connection. The status message at this stage is «Looking up…»

An error occurred sending mail: Unable to connect to SMTP server server name The server may be down or may be incorrectly configured. Please verify that your Mail/News account settings are correct and try again.

• The server does not exist (but it might exist when you are connected to some other network).
• You typed the server name wrongly. (Even an extra space can make it fail.)
• Your ISP’s DNS is broken. Try disconnecting and reconnecting, or contact your ISP.

This error is never caused by the server being down or incorrectly configured.

Connecting

Thunderbird connects to the SMTP server, and the SMTP server responds. The status message at this stage is «Connecting…»

The message could not be sent because connecting to SMTP server server name failed. The server may be unavailable or is refusing SMTP connections. Please verify that your SMTP server setting is correct and try again, or else contact your network administrator.

or:

An error occurred sending mail: The mail server sent an incorrect greeting: message

• You specified the wrong server. The server you specified exists, but it is not an SMTP server.
• You specified the wrong port number. Ask whoever runs the SMTP server what the correct port number is.
• The server is down. This is usually temporary. If it persists, contact whoever administers the server.
• Your firewall is blocking the port.
• Your ISP is blocking the port. This often affects port 25, and you can often work around it by using port 587, but details depend on your ISP and on the SMTP server’s configuration.
• See also the Security and Logging in sections, below.

An error occurred sending mail: SMTP server error. The server responded: error message Contact your mail administrator for assistance.

• In general, this indicates an error message was returned from the server, and that message is echoed as received.
• If the error message is The server responded: Syntactically invalid EHLO argument(s), you may have encountered an issue caused by a faulty hostname used as argument for the initial greeting. This problem is frequently seen with Mac OSX. Following options:
  • make sure that the hostname of your machine does not have a dot (.), underscore (_), any other special character except hyphens (—), or line breaks in it (you will have to look up the respective operating-system setting);
  • if this doesn’t work, or if you can’t set the hostname on your machine, see this post for instructions on how to set the greeting argument explicitly (only characters, numbers, and hyphens «-» inbetween are allowed).

Security

If your settings require it, Thunderbird creates a secure connection using TLS or SSL. The status message at this stage is «Connected…»

The message could not be sent because connecting to SMTP server server name failed. The server may be unavailable or is refusing SMTP connections. Please verify that your SMTP server setting is correct and try again, or else contact your network administrator.

• You specified SSL, but the server does not support it. In this case Thunderbird makes a connection, but its attempt to use SSL times out, so the status message is «Connected…», and there is a delay (normally 60 seconds) before you see the error message.
• Your anti-virus program doesn’t support SSL.
• See also the Logging in section, below.

An error occurred sending mail: Unable to connect to SMTP server server name via STARTTLS since it doesn’t support EHLO. Please verify that your Mail/News account settings are correct and try again.

or:

An error occurred sending mail: Unable to connect to SMTP server server name via STARTTLS since it doesn’t offer STARTTLS In EHLO reponse. Please verify that your Mail/News account settings are correct and try again.

• You specified TLS, but the server does not support it.
• Your anti-virus program doesn’t support TLS.
• The mail server supports SSL, not TLS. Sometimes the email provider’s documentation is incorrect.

Logging in

If your settings require it, Thunderbird logs in by sending your username and password. If the server does not accept the username and password combination, then Thunderbird asks you for the password again. If your password does not work, there might be various reasons:

• You typed the wrong password. Perhaps it is case sensitive.
• You specified the wrong user name. Perhaps it needs to be your entire e-mail address, or perhaps only part of your e-mail address.
• You are connecting to the wrong server, and this server does not recognize your username.
• Your user name is not yet registered on the server.
• The server is broken.

The message could not be sent because connecting to SMTP server server name failed. The server may be unavailable or is refusing SMTP connections. Please verify that your SMTP server setting is correct and try again, or else contact your network administrator.

• You specified that a username and password are required, but you did not specify any username.

Identity

Thunderbird tells the server who is sending the message. This is the From address, your identity in Thunderbird.

An error occurred while sending mail. The mail server responded: error message Please verify that your email address is correct in your Mail preferences and try again.

• The server requires login with a username and password, but you did not specify this in your settings.
• The server requires security, but you did not specify this in your settings.
• The server only accepts mail from one e-mail address for your username, and you have used an identity containing a different e-mail address.

Recipients

Thunderbird tells the server who is receiving the message.

An error occurred while sending mail. The mail server responded: error message Please check the message recipients and try again.

• The server requires login with a username and password, but you did not specify this in your settings.
• The server requires security, but you did not specify this in your settings.
• There is a problem with one or more of the message recipients’ e-mail addresses.

Sending

Thunderbird sends the message.

An (SMTP) error occurred while sending mail. The server responded: error message

• The server did not allow Thunderbird to start sending the message.

An error occurred while sending mail. The mail server responded: error message Please check the message and try again.

• Thunderbird sent the message, but the server failed to process it.

The size of the message you are trying to send exceeds a temporary size limit of the server. The message was not sent, try to reduce the message size and try again. The server responded: error message

or:

The size of the message you are trying to send exceeds the global size limit ( number bytes) of the server. The message was not sent, try to reduce the message size and try again.

or:

The size of the message you are trying to send exceeds the global size limit of the server. The message was not sent, try to reduce the message size and try again. The server responded: error message

• The message really is too big.
• The server is broken or badly configured.

Confirmation

The SMTP server tells Thunderbird that it received the message.

Sending of message failed. Please verify that your Mail & Newsgroups account settings are correct and try again.

• You pressed Cancel to stop the sending process. The message was probably not sent, but if you left it too late then the message might have been sent.
• The server failed to confirm that the message was sent. There is no way to tell whether the message was sent or not.

Network errors

Things can go wrong with the network at any stage in sending a message. These errors are not related to the SMTP server, but they can interrupt communication with the server, so that sending the message fails.

A communications error occurred: error message Please try again.

or:

A network error occurred while receiving data. (Network Error: error message) Try connecting again.

• There is a problem with your network connection. Try disconnecting and reconnecting. If it still does not work, contact your ISP.

Security software errors

Its a bad idea for your anti-virus software to scan outgoing messages, especially over a secure connection. That or a problem with some type of security suite can cause an error message such as:

The message could not be sent because the connection to SMTP server server name was lost in the middle of the transaction. Try again or contact your network administrator.

This is different from a problem with your firewall rules, which prevents Thunderbird from making a connection to the mail server.

Server errors

Here is a list of the standard server error codes, and brief explanations. Servers often report different messages, they often represent the code with full stops, (like 4.2.1 instead of 421), and they often use non-standard codes (for example, 571 instead of 530).

Most of these errors usually indicate faults on the server. 530 or 551 means that you are using the wrong server name, or the wrong port, or you have not specified that Thunderbird must log in with your user name and password. 554 can mean that your ISP is blocking the port.

See also

• Network tools for server connections
• Session logging for mail/news

Finally appears that I got it to work with 1.5.4.0 and GoDaddy!

In /tools/swift/Swift/Message.php line #79

Change

$this->setFrom(«»);

To

$this->setFrom(«[email protected]»);

In /tools/swift/Swift.php after line 370

if (!($has_reply_to = $message->getReplyTo())) $message->setReplyTo($from);

Add the following code:

if (!$has_reply_to[0]) $message->setReplyTo($from->getAddress());

In /tools/swift/Swift/Plugin/MailSend.php line # 159

Add

$params = «»;

SMTP Settings

Mail Domain Name: yourdomain.com (no www)

SMTP Server: smtpout.secureserver.net

SMTP User: your full email address

Password: your email password

Encryption: none

Port: 80

Make sure you have SMTP relay turned on in your GoDaddy email settings. You may need to buy additional relays. By default, most hosting with them comes with only 250 relays. You will have one relay for every email out. Remember, emails are generated for welcome email for new users, new customer email to you, wishlist alert emails, newsletter emails, order emails, order history change emails, etc. You will use up 250 fast!

Make sure you have SMTP relay turned on in your GoDaddy email settings. You may need to buy additional relays. By default, most hosting with them comes with only 250 relays. You will have one relay for every email out. Remember, emails are generated for welcome email for new users, new customer email to you, wishlist alert emails, newsletter emails, order emails, order history change emails, etc. You will use up 250 fast!

Edited April 16, 2013 by AFemaleProdigy

(see edit history)

Hi dsomer.

There are 2 common reasons why customers are getting this error message.

1. TPG e-mail servers detected some virus or malware on the e-mails that you are sending.

2. TPG e-mail server has detected that your account is sending message to a large number of recipients; Unsolicited bulk email (UBE) / Unsolicited commercial email (UCE).

You can follow the simple steps below to fix this issue:

1. Change you TPG account password online: https://www.tpg.com.au/home/myaccount

2. After changing the password Wait for 15-30 minutes before testing the mail.

Note: If you are sending e-mails to a large number of recipients (Exp: More that 50 recipients) please enable the SMTP authentication on the e-mail client settings to avoid getting banned by the server.

Let us know how it will go. 

I have this exact error as well.

on Friday I reset my password and everything worked ok. I sent out 2 emails which worked perfectly and I also checked my Chromecast network was functioning and it was.

I then watched 3 hours of free to air TV and realised the my internet connection was not working….eventually I realised I had not changed my parsowrd in the actual modem which I then did….and after 15 minutes of 3 times rebooting my modem from wothin the modem router software my internet returned as did my chromecast……I still received emails over the easter weekend but just now trying to SEND emailsis a complete disaster with this error:-

Sending of the message failed.
An error occurred while sending mail. The mail server responded: [TPG-A02] Authentication denied. User dsomer@tpg.com.au is banned from using SMTP AUTH due to previous abuse. Please verify that your email address is correct in your account settings and try again.

HELP!!!!!