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On Thu, Jul 04, 2002 at 02:20:06PM +0100, Philip Hazel wrote:
| On 4 Jul 2002, Nigel Metheringham wrote:
|
| > > 12:52:38 SMTP protocol violation: synchronization error (next
| > > input sent too soon): rejected "DATA" H= ...
| >
| > Its part of ESMTP pipelining.
|
| This can happen without pipelining. SMTP is a "lockstep" protocol - the
| client MUST wait for the server response at certain points. Exim 4
| enforces this, to stop spammers who just send out the whole thing in one
| packet and then go away.
It also helps protect against the HTTP form submission vulnerability,
but I think the 5-bad-commands-and-you're-out check will handle that
first.
-D
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Come to me, all you who are weary and burdened, and I will give you
rest. Take my yoke upon you and learn from me, for I am gentle and
humble in heart, and you will find rest for your souls. For my yoke
is easy and my burden is light.
Matthew 11:28-30
http://dman.ddts.net/~dman/
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