Icedove version 38.4.0-1-deb7u1+7.0trisquel2 issues

Icedove version 38.4.0-1-deb7u1+7.0trisquel2 seems to have many issues including:

- Failed connections to some SMTP servers
- Fails to sent e-mails with attachments

A forum thread containing many user complaints can be found here:
https://trisquel.info/en/forum/icedove-version-3840-1-deb7u170trisquel2-fails-connect-openmailboxorgs-imap-and-pop3-servers

A downgrade to Icedove 31.8.0-1~deb7u1+7.0trisquel2 fixes the issues for me but this can't be a solution forever. Thanks a lot for having a look into this issue. :-)