[Akonadi] [Bug 387926] Release version 17.12: Sending a mail with SMTP fails with: org.kde.pim.ksmtp: Socket error: 1

[kzi]

https://bugs.kde.org/show_bug.cgi?id=387926

--- Comment #31 from kzi <kde at snafu.de> ---
(In reply to Fabian Vogt from comment #30)
> ksmtp sends the server's hostname instead of the local hostname by accident
> with the "EHLO" command. The mail.snafu.de server rejects that immediately,
> but example.com works.
> 
> Please try this workaround to confirm: In the account configuration dialog,
> in the "advanced" tab, enter "example.com" as "Send custom hostname to
> server".

Indeed, that works around my issue. After your hint I learned:

> telnet mail.snafu.de 587
EHLO foo.bar
250-... (ok)
EHLO mail.snafu.de
550 EHLO/HELO not allowed by local policy.
Connection closed by foreign host.

So seemingly /every/ EHLO domain parameter but the server host is accepted!
Thank you so much for this offtopic help!

> Please open a new bug report for that.

I will, now that I have a clue. ;)

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