From: Oles' Hnatkevych (no email)
Date: Wed Jan 02 2002 - 06:51:27 EST
Hello Michael,
Wednesday, January 02, 2002, 2:44:51 PM, you wrote:
Of course a user can spoof email address and make other
things, but I believe not only my organisation needs
features like this, but others too. And I presume
postfix is a program for people, not for developers of postfix ;)
MT> Oles' Hnatkevych wrote:
MT> Limiting message size at smtpd level does not work, unfortunately.
MT> First of all, it works only for ESMTP and if the remote server
MT> correctly uses SIZE= ESMTP extension. It doesn't work if
MT> a) message submitted by a way different from smtp
MT> b) message submitted by a non-ESMTP mailers
MT> c) remote smtp server does not use SIZE= ESMTP extension or
MT> uses fake number (the SIZE= is voluntary, remote can say
MT> any number here)
MT> d) message sent to multiple recipients in case per-recipient
MT> limits are different
MT> e) per-sender limits doesn't work if a sender is forged.
MT> Cases a-c can be worked around if the similar limits will be implemented
MT> in cleanup daemon.
MT> Moreover, it's not usually practical to limit a size of individual
MT> messages, unlike the mailbox storage.
Best regards,
Oles' mailto:
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