Re: message_size_limit per user

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message_size_limit per user
\ LinuxCorporate [ Postfix ] (27 Mar 2008)
. \ (Wietse Venema) (27 Mar 2008)
. \ Patrick Ben Koetter (27 Mar 2008)
. . \ mouss (27 Mar 2008)

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Subject:	Re: message_size_limit per user
Group:	Postfix-users
From:	mouss
Date:	27 Mar 2008

Patrick Ben Koetter wrote:
> * LinuxCorporate [ Postfix ] <lista.postfix>:
>
>> Hi Everybody,
>>
>> It's possible to set a diferent message_siz_limit to some users, for I have
>> this set in my main.cf.
>>
>
> Yes, but you will break the RFC. In the beginning of an ESMTP session the
> server announces the maximal message size it will accept. If you alter (read:
> lower) that limit later, client will decide to send and may be rejected later.
>
> To enforce different message size limits use the policyd policy service.
>
>
the conclusion is ok. but the way it is stated, the argument seems to
contradict the conclusion ;-p there is no rfc problem in refusing a
message once it was read whatever is the advertized size in EHLO. That
said, this is not "nice", and in the case of multiple recipients, per
recipient limits are problematic (If I receive a mail, i assume that
people in the To/Cc headers also received it).

today, the design choice of the RFC is debatable (or outdated?). it
would have been better to let the client announce the size and the
server would say if it's ok or not (why would I tell a foreign client
what my limits are?). The size could be given with the MAIL FROM, which
allows per sender limits (and doesn't add yet another esmtp command).
also, to prevent lies, a server could reject mail if the actual size is
much more than the advertized one. but heh, it's too late...