My e-mail client doesn’t show anything in the sent box, or anything equivalent in my language (Dutch)
I therefore can’t truly tell if a message is sent.
I do see the e-mail appearing and disappearing in the outbox and it works on my thunderbird desktop client.
I have also noticed, that there are some duplicate folders which are only local. This should not be and is in my opinion a bug. It seems that the Mailsetup creates those folders maby because the online folder is not discovered correct via IMAP.
For me, it is:
“Gesendet” (Sent) is there twice with the same nametag
“Postausgang” (Outbox) twice with the same nametag
“Entwurf” and “Entwürfe” (Drafts vs. Drafts)
“Junk” and “Unerwünscht”
On of them is always only local and seems to be prefered target. It would be better, if one could assign folders manually like in Thunderbird.
I run into this once again with somehow important mails. I’m never sure if mails are really sent to the recipient and confused if they do not appear on my other IMAP clients. This really is a annoying bug.
Also, somehow i can not really forward from the duplicate (in my case German named “Gesendet” duplicate of “Sent” folder). Normally sending mails from that account does indeed work.
I.e. I had a directory named the same as the IMAP namespace folder name ‘Sent’.
This worked fine with most mail clients where you can set the sent/fcc mailbox, but not with SFOS mail.
I have now changed the directory name to sent-mails, created a mailbox called sent-mails/sent-default, and created a symlink called ~/mail/Sent pointing to that.
Killed all imapd processes on the server and restarted SFOS mail to send a message. And yo and behold, the sent message appears where it is supposed to.
TL;DR: if you can, check that the ‘Sent’ mailbox on you server is a real mailbox, and not a directory, or subfolder of another mailbox.
Note that L10N should not matter, i.e. ‘Gesendet’ is not a real name, in IMAP there is only and literally ‘Sent’.
I don’t know what mail server software the providers linke mine (manitu.de) implement, but it would very welcome to adopt the IMAP handling in the SFOS GUI to the specifics, as i can not influence the provider on that and it works with all my other clients. So i wouldn’t blame the mail provider or his implementation at the moment for this.