I also opened a new ticket (https://trisquel.info/en/issues/16300) concerning this bug a while ago but nobody seems to care about it so far... I really hope that this will be fixed with Trisquel 8.
I also have many issues with Icedove. Some of them could be resolved by
following the hints mentioned here
(https://trisquel.info/en/forum/icedove-version-3840-1-deb7u170trisquel2-fails-connect-openmailboxorgs-imap-and-pop3-servers#comment-84924).
- [Trisquel-users] Unable to send attachments through... elkingrey
- [Trisquel-users] Re : Unable to send attachmen... mtlben
- Re: [Trisquel-users] Unable to send attachment... albertoefg
- Re: [Trisquel-users] Unable to send attachment... bho71
- Re: [Trisquel-users] Unable to send attachment... john_harvey
- Re: [Trisquel-users] Unable to send attachment... ilreh
- Re: [Trisquel-users] Unable to send attachment... gromobir
- Re: [Trisquel-users] Unable to send attachment... ilreh
- Re: [Trisquel-users] Unable to send attach... cd1207
- Re: [Trisquel-users] Unable to send at... Adonay Felipe Nogueira
- Re: [Trisquel-users] Unable to send attachment... cd1207
