14 Oct
2008
14 Oct
'08
2:51 p.m.
Kai Schaetzl wrote:
Sean Carolan wrote on Tue, 14 Oct 2008 08:13:34 -0500:
My mail logs are showing that customers who specifically disallow ICMP traffic have many "Connection Reset" entries in our logs:
Could somebody explain why ICMP might play a role in mail delivery?
It doesn't really. If the OP had PMTU discovery turned on it would affect most all communications not just email. I can't ever remember having it on for external networks, there's never been a need in my case.
It's just likely that the only communications between the OP's systems and the other side was email.
nate