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,
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 :-) ).