Tickets :: [#14595] Missing MIME-Version Header leads to render issues

6.0.0-beta1

7/4/25

Summary	Missing MIME-Version Header leads to render issues
Queue	IMP
Queue Version	FRAMEWORK_5_2
Type	Bug
State	Not A Bug
Priority	1. Low
Owners
Requester	rene.marth (at) hetzner (dot) de
Created	03/13/2017 (3035 days ago)
Due
Updated	03/16/2017 (3032 days ago)
Assigned
Resolved	03/14/2017 (3034 days ago)
Github Issue Link
Github Pull Request
Milestone
Patch	No

03/16/2017 03:26:33 AM	Michael Rubinsky	Comment #4	Reply to this comment
Then could you please explain why other mail clients displays the mails correctly? Because they are broken and this behavior represents a security issue. Of course the mails are not standard conform - but you are the only mail client I know that makes garbage out of such a mail. Is it really more important to rely on a RFC instead of solving the issue for your users? See ~~Bug: 12062~~ for more of our thoughts on this. Messages without MIME-Version header are not MIME messages but plain text RFC2822 messages. Period. There is no room for interpretation.

03/15/2017 07:19:13 AM	rene (dot) marth (at) hetzner (dot) de	Comment #3	Reply to this comment
Then could you please explain why other mail clients displays the mails correctly? Of course the mails are not standard conform - but you are the only mail client I know that makes garbage out of such a mail. Is it really more important to rely on a RFC instead of solving the issue for your users? Messages without MIME-Version header are not MIME messages but plain text RFC2822 messages. Period. There is no room for interpretation.

03/14/2017 03:22:18 PM	Jan Schneider	Comment #2 State ⇒ Not A Bug	Reply to this comment
Messages without MIME-Version header are not MIME messages but plain text RFC2822 messages. Period. There is no room for interpretation.

03/13/2017 11:19:40 AM	rene (dot) marth (at) hetzner (dot) de	Comment #1 Priority ⇒ 1. Low Patch ⇒ No Milestone ⇒ Queue ⇒ IMP Summary ⇒ Missing MIME-Version Header leads to render issues Type ⇒ Bug State ⇒ Unconfirmed	Reply to this comment
An email that lacks the MIME-Version Header is rendered incorrectly in IMP. Yes, it is known that RFCs says that this is a required field. However not all emails in real life have such a header and other mail client vendors gives a reasonable fallback (if no header then assume mime-version: 1.0)