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

Mails composed as HTML is sent as plain text if it does not contain any formatting

  • 2 replies
  • 4 have this problem
  • 1 view
  • Last reply by behoocco

more options

Since one of the lase TB versions HTML mails are sent as plain text, but only if no formatting is applied. This is a problem because for plain text mails I configured line wrap. So lines are wrapped unexpectedly. A suitable workaround is to add a bold space character, but sometimes I forget.

This is the header of such a mail:

User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101

Thunderbird/52.5.0

Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Language: de-DE MIME-Version: 1.0

Since one of the lase TB versions HTML mails are sent as plain text, but only if no formatting is applied. This is a problem because for plain text mails I configured line wrap. So lines are wrapped unexpectedly. A suitable workaround is to add a bold space character, but sometimes I forget. This is the header of such a mail: User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Language: de-DE MIME-Version: 1.0

Chosen solution

What setting have you got under your 'Send options' ?

Menu icon > Options > Options > Composition > 'General' tab click on 'Send Options' button. See image below.

Please post image of your settings.

Read this answer in context 👍 1

All Replies (2)

more options

Chosen Solution

What setting have you got under your 'Send options' ?

Menu icon > Options > Options > Composition > 'General' tab click on 'Send Options' button. See image below.

Please post image of your settings.

more options

Thanks a lot!

Unselecting "send message as plain text if possible" solves my problem.

I suppose is a new option with a non backward compatible default setting (selected). I never noticed it before and did not observe messages being sent as plain text when composing as HTML.