both multipart/alternative parts are shown in a nested message

[mikelward]

I sent a message from Roundcube in HTML format. It sends a message in MIME multipart/alternative format with the first part being text/plain and the second part being text/html. A MIME mail client is supposed to display only the HTML part if it supports HTML. That part seems to be working fine.

The message bounced, and I got a nested MIME message back with the reason for the bounce as the first part and my original message as the second part. As my original message was also a MIME message, the structure of the bounce message looked like: text/plain message/rfc822

multipart/alternative

text/plain text/html

When viewing the bounce message, RoundCube displayed both the text/plain and the text/html version of the nested message. It should only display the text/html version.

May be related to ticket 1484627.

[mikelward]

source of offending message (sanitized version)

[thomasb]

I think the behaviour is OK because it's a message/rfc822 and there it might be helpful to see all the content of the rejected message.

[alec]

It's multipart/alternative, so I think we can live without that part ;)

[thomasb]

Unfortunately the message structure provided by the IMAP server does not contain the message headers and therefore we cannot detect it to be multipart/alternative. The content-type we get of this message part is message/rfc822.

To fix this issue RoundCube needs to fetch the raw message part and parse it itself.