This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Thunderbird converts all my "forward" emails with attachments into .eml files and rejects them

  • 2 replies
  • 2 have this problem
  • 1 view
  • Last reply by k.j.r.m.

more options

After many years of satisfaction using T'bird, I have been afflicted by an auto error condition lately that prevents me from forwarding any emails. They are returned promptly with explanations that '.eml' files are used by scammers. In fact, T'bird invents .eml files, especially for any attachments. Result: I cannot forward any emails and cannot find the setup to correct the situation.

After many years of satisfaction using T'bird, I have been afflicted by an auto error condition lately that prevents me from forwarding any emails. They are returned promptly with explanations that '.eml' files are used by scammers. In fact, T'bird invents .eml files, especially for any attachments. Result: I cannot forward any emails and cannot find the setup to correct the situation.

Chosen solution

Are you sure the add extension to file name option is still unchecked in Tools > Options > Composition > General, in case it was before? The option next to it decides whether forwarded messages are sent inline or as attachment, so you may need to check both. Also see here - do note that the issue may be caused by the email server, not Thunderbird in particular. I think that’s what happens here.

Read this answer in context 👍 2

All Replies (2)

more options

Chosen Solution

Are you sure the add extension to file name option is still unchecked in Tools > Options > Composition > General, in case it was before? The option next to it decides whether forwarded messages are sent inline or as attachment, so you may need to check both. Also see here - do note that the issue may be caused by the email server, not Thunderbird in particular. I think that’s what happens here.

more options

Thanks. Add extension to file choice worked. Untick this to avoid my problem!