11 Feb
2004
11 Feb
'04
8:48 p.m.
Will Yardley wrote:
My understanding is that in most cases, providers are blocking port 25 outbound to prevent direct to MX spamming from their customers' machines
If you do that, please put in a corresponding ACL to block port 25 inbound _and_ outbound. Otherwise, you just might get bitten by something like spoofed source routing, as several providers have found out in the past. srs