Tickets :: Comment on [#4814] vlad.horde.org timeout after EHLO

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Comment	> Anything that is short and keeps packet sizes under 1480 will come > through. Mail generated by hand (either telnet to port 25 or using > "mail" or "sendmail" or whatever) is generally going to be mall > enough due to a lack of normal amount of list-related headers. > > > > The problem is caused because a) something (either directly on coyote > and vlad, or something in the network) is filtering ICMP traffic, and > b) something in the network path has an MTU of 1480. Because of the > ICMP filtering, ICMP MUST-FRAGMENT isn't being sent, breaking PMTU.
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