Mozilla Client Thunderbird error while sending email

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I'm using Mozilla Thunderbird Email Client. When I try to add a mailing list in the BBC field I get this error.

'An Error occurred while sending mail. The Mail server responded: sorry, your envelope recipient domain must exist (#5.7.1). Please check the message recipients and try again.'

I have 90 addresses in the mailing list.

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Best Answer by kskumar537
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Answered By 0 points N/A #86904

Mozilla Client Thunderbird error while sending email

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The true reason is that the Mozilla browser that was used was corrupted. There might be a problem in the set up files.

The other reason would be the browser that you used is a free trial version. If it is a trial version, then it is mandatory to upgrade but if it is not a trial version, you need to install a new Mozilla browser from the internet.

Answered By 0 points N/A #86909

Mozilla Client Thunderbird error while sending email

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Hi and Good Day.

In this kind of issue, your email server supports authentication, but Thunderbird is set to do secure authentication. You need to disable that so it’ll do normal authentication. Here’s how:

  1. Go to Tools>Account Setting. Go to “Outgoing Server (SMTP)” at the near bottom of the list on left-hand side.
  2. Select the appropriate SMTP server from the list of SMTP servers, there may be only one on the upper right hand side.
  3. Click the 'Edit' button to the right of the list.
  4. Under Security and Authentication, uncheck ‘use secure authentication’.

While you’re in there, verify your username is in the format required by your mail service provider (usually your full email address), then click the OK buttons to close the setting.

Thank you.

Regards,
Henjov22
Answered By 0 points N/A #86906

Mozilla Client Thunderbird error while sending email

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Here is a solution for your problem. Try to follow these instructions, it will be fruitful.

  1. Right click on the McAfee System tray icon and select Virus Scan console.
  2. Double click access protection. Select ‘prevent mass mailing worms from sending mails’. Be sure not to uncheck this box.
  3. Click on the edit button and add the comma (,) at the end of a text box at the bottom of the window and then add ‘THUNDE~1.exe’. Do not put the space between this and the previous entry.
  4. Click OK and close the virus scan console window.

I hope, after this, you are again able to send e-mails.

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