Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

How do I set default mime type to multipart/alternative ?

  • 2 replies
  • 2 have this problem
  • 1 view
  • Last reply by jklu

jklu
jklu
more options

Since a few weeks my thunderbird mails to gmail recipients arrive in their spamboxes by default. Some research discovered that Google won't classify these mails as spam if they are multipart/alternative (text/plain + text/HTML) Now, in the Thunderbird settings I can select either text/plain or text/html as defaults for gmail.com recipients but not both.

I can set the format to both per individual email, but not automatically.

Is there some deep config item which I can use ?

Since a few weeks my thunderbird mails to gmail recipients arrive in their spamboxes by default. Some research discovered that Google won't classify these mails as spam if they are multipart/alternative (text/plain + text/HTML) Now, in the Thunderbird settings I can select either text/plain or text/html as defaults for gmail.com recipients but not both. I can set the format to both per individual email, but not automatically. Is there some deep config item which I can use ?

Chosen solution

Thanks for the hints.

My ISP does not use SPF records which might be part of the problem.

Anyways, after posting the question here I did some more analysis and it turns out that the only way to get Gmail to accept the mail is to use the always-html extension. https://addons.mozilla.org/nl/thunderbird/addon/always-html/

Somehow this does something different than configuring "send options".

If I switch "always-html" off then mail goes to the gmail spam folder and if I switch it on mail arrives in the gmail inbox folder of my gmail contacts.

Thanks again for your efforts.

Read this answer in context 👍 0

All Replies (2)

Toad-Hall
Toad-Hall
  • Top 10 Contributor
more options

Via the Address Book, you can specify whether they prefer Plain or HTML, but if left 'unknown' and your send options state to send both, then even if you compose in HTML, it will get sent as both.

You can choose to send as both. Thunderbird > Preferences > Composition > General tab click on 'Send Options' button

Text format: select ' Send the message in both plain text and HTML' click on ok.

http://kb.mozillazine.org/Plain_text_e-mail_-_Thunderbird

But if your emails are going to spam folders in recipients gmail accounts, it is more likely you are composing emails that gmail believes contains spamlike signs. Maybe it is the subject or content or maybe your email address or IP address has been flagged as sending spam.

jklu
jklu Question owner
more options

Chosen Solution

Thanks for the hints.

My ISP does not use SPF records which might be part of the problem.

Anyways, after posting the question here I did some more analysis and it turns out that the only way to get Gmail to accept the mail is to use the always-html extension. https://addons.mozilla.org/nl/thunderbird/addon/always-html/

Somehow this does something different than configuring "send options".

If I switch "always-html" off then mail goes to the gmail spam folder and if I switch it on mail arrives in the gmail inbox folder of my gmail contacts.

Thanks again for your efforts.