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http://bugs.kde.org/show_bug.cgi?id=126534         
           Summary: Can't send mail: "Unknown error code 50"
           Product: kmail
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kmail-devel kde org
        ReportedBy: juuso.alasuutari tamperelainen org


Version:            (using KDE KDE 3.5.2)
Installed from:    Compiled From Sources
Compiler:          gcc 4.0.3 CFLAGS: "-march=pentium-m -mmmx -mfpmath=sse -msse2 -pipe -Os"
OS:                Linux

Trying to send a gpg signed message and/or with attachment through an authenticating mailserver fails with the following message:

  Sending failed:
  Unknown error code 50
  The message content was not accepted.
  The server responded: "<my.isp's.mail.server> Lost connection to [<my.ip.address>]"
  This is a temporary failure. You may try again later.
  Please send a full bug report at http://bugs.kde.org.
  The message will stay in the 'outbox' folder until you either fix the problem (e.g. a broken address) or remove the message from the 'outbox' folder.
  The following transport protocol was used:
  foo

Sometimes it also asks: "Do you want me to continue sending the remaining messages?" If I answer yes, the message is usually sent. But for some messages it doesn't offer to retry at all.

Sending the exact same messages with same mail settings with sylpheed is no problem. Also sending through my ISP's non-authenticating smtp server with KMail works.

I noticed a few bugs about some mailservers not accepting 8-bit MIME message content. Those error messages were also code 50. I'm not sure if this is the same problem, but if it is, could it have something to do with the message header? I don't see any other reason why the server would happily accept messages sent from sylpheed. On the other hand, I don't know why the same message sent from KMail the second time would differ so that it's accepted.
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