> I don't think the problem is in the /etc/passwd file, because an
interactive login to account "1234" is OK, and the rejection log comes from
the imapd daemon.
> And the rejection is only for a all-numeric account. I have tested for a
numeric beginning account with letters, and IMAP delivery is OK.

I confirm that the problem is with Cyrus IMAP daemon.
I have just tried with UW IMAP and message delivery is OK.
Is it possible to modify Cyrus to accept all-numeric accounts ?

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