[kmailtransport] [Bug 388160] New: ksmtp EHLO sends server hostname as domain parameter by default

[kzi]

https://bugs.kde.org/show_bug.cgi?id=388160

            Bug ID: 388160
           Summary: ksmtp EHLO sends server hostname as domain parameter
                    by default
           Product: kmailtransport
           Version: unspecified
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: kde at snafu.de
  Target Milestone: ---

As Fabian Vogt pointed out elsewhere
(https://bugs.kde.org/show_bug.cgi?id=387926#c30), ksmtp sends the server
hostname as the EHLO domain parameter (confirmed via telnet and wireshark):
    EHLO mail.snafu.de
    550 EHLO/HELO not allowed by local policy.
In this case my Provider rejects the EHLO, which results in failure to
transport the e-mail.

Any other domain will be accepted:
    EHLO foo.bar
    250-sour.ops.eusc.inter.net Hello ...

Consequently, this can be worked around by specifying an explicit custom
hostname in the SMTP settings e.g. in kmail2. It has been recommended somewhere
that in case the client has no (meaningful) domain, the bracketed IP address
should be sent, such as:
    EHLO [nnn.nnn.nnn.nnn]
In my case, this is accepted, too.

I'm not 100% sure this is a bug, but it seems sane client behavior not to tell
the server it ought to talk to itself. It's understandable that the server
would test for this domain and none else.

This issue didn't arise until a couple of days ago. I do not know what the
default EHLO parameter was before that change.

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