Posting to developer ML problematic

[MK-MacPorts at techno.ms]

I have received responses like these from Mac OS Forges' mail server:

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This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. This is a permanent error. The following address
failed:

"macports-dev at lists.macosforge.org":
SMTP error from remote server in greeting:
host: mail-in.apple.com:
5.7.1 You are not allowed to connect.
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and I don't know why…

I am subscribed to the list, but the mail server seems to forget that at times!