Hi,

I'm trying to send mail with kmail (embedded in kontact), and basically, when I hit send **nothing happens** as far as the actual sending is concerned.
The mail is stored in my local "outbox" folder, and then sits there forever.

On my mailserver I do not even see a connection attempt.
KDE/Plasma versions:

Operating System: openSUSE Leap 15.2
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.3.18-lp152.69-default
OS Type: 64-bit
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-4210U CPU @ 1.70GHz
Memory: 15.6 GiB of RAM
Graphics Processor: Mesa DRI Intel® Haswell Mobile

Mailserver: Postfix 3.4.7, configured to run TLS on port 465 - kmail properly autodetects the correct settings and everything.

When I manually do a "send outgoing mail" in kmail, nothing happens either.

Using Thunderbird (or any other mail client, like the built-in stuff on my smartphone) works fine in both directions...

And like I said: there isn't even a connection attempt in my mail server's log.

Any ideas?

I've traced my network traffic with wireshark on the server side - NOTHING.
and now without actually changing anything on either side, I get a popup from kmail saying "remote server closed the connection", and now it works again - and of course that popup doesn't actually make any sense here since I've even rebooted the client several times by now...

another reboot later: kmail forgot the password for the smtp account, I manually put it in, and we're back to step 1: mail sits in outbox forever.

Gonna file a bugreport.

lemmy04 wrote:another reboot later: kmail forgot the password for the smtp account, I manually put it in, and we're back to step 1: mail sits in outbox forever.

Gonna file a bugreport.

There is a long time history of KMail not being able to send e-mails more or less silently (https://bugs.kde.org/show_bug.cgi?id=388068), sometimes improper error messages such as "network unreachable" are reported (see https://bugs.kde.org/show_bug.cgi?id=392653). Try to see if filing a new bug makes sense or you could comment on one of the existing ones.

I had the exact same problem.
For me this turned out to be the SMTP server settings. While setting up the account, kmail never gave me the option to specify (advanced) smtp server settings, so when I looked at the setup, it was using port 25 instead of 587+StartTLS.
After fixing that, sending works.

Settings -> Configure KMail -> Sending