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Re: Proposal for Adjusted DATA Timeout

2008-05-24 23:56:03

Hi Ned,
At 17:38 24-05-2008, ned+ietf-smtp(_at_)mrochek(_dot_)com wrote:
As for their utility, our experience has been that this is one of those things
that's rarely needed, but when it is needed you REALLY need it, because without
it you have to choose between crap client performance or large messages being

Some sites use a lower timeout than the MTA defaults for the data block (i.e. the overall timeout for the data phase). When a client connecting over slow links or having issues on the connection between the client and the server tries to send a large message, it hit this limit. As you pointed out, it's a rare case but it can really be needed.

This seems more like something for RFC 1870 as both sides have to support the SIZE extension. Adjusting the data timeout like that can also open the way for a denial of service (you already know that :-) ).