get "550 Administrative prohibition" sending a mail using claws to launchpad mailing lists

[Gerald Dachs]

Sending the attached mail to any launchpad mailinglist. I get the following error:

<email address hidden>: host forster.canonical.com[91.189.90.190] said:
    550 Administrative prohibition (in reply to end of DATA command)

or

<email address hidden>: host forster.canonical.com[91.189.90.190]
    said: 550 Administrative prohibition (in reply to end of DATA command)

Sending the same message using squirrelmail works without Problems.

I understand that this might not be a problem of mailman, but sinzui on #launchpad told that the mailman project maintainer is using claws himself. Maybe he will find the problem.

I am using karmic with claws mail 3.7.2

Regards
Gerald

[Mark Sapiro (msapiro)]

Mailman never saw this message. It was blocked by the incoming MTA at forster.canonical.com. It looks like some kind of spam prevention at work, but only the mail admins at forster.canonical.com can tell you what's going on here and why it only affects mail from one specific MUA.

I don't know which mailman project maintainer is using claws, but it's not me, and I don't think it's Barry either.