Hi,

>> Quick question: With Dovecot (or other LMTP servers) does this
>> detect over-quota conditions? The Postfix verification probe does
>> not send any message data, just "MAIL FROM", "RCPT TO" and then
>> "RSET" + "QUIT" (or perhaps just "QUIT").
> 
> Postfix sends the message size in the MAIL FROM command.  If the
> recipient is already over quota, then the LMTP server can reject
> the message regardless of size. Otherwise, the LMTP server can
> decide if the message would put the recipient over quota.
> 
> If this is indeed how Dovecot works, then quota checks via
> reject_unverified_recipient would be a good alternative, compared
> to policy servers or access maps.
> 
>       Wietse
> 
>> So if the LMTP server does not reject "RCPT TO" for over-quota
>> recipients, the probe will only confirm recipient existence. Of
>> course an LMTP server should ideally detect over-quota before
>> message transfer begins, so perhaps Dovecot and other implementations
>> do that.

I also will test, if "sieve reject" is working the same way. If so, I can 
enable this flag and give users a chance to reject unwanted mails in session.

-Christian Rößner

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