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Re: Port 25 filters - how many here deploy them bidirectionally?
On Sun, 9 Jan 2005, Suresh Ramasubramanian wrote: > > .. and if it has been tried, have you noticed any issues with this? > > Please consider the situation of net abuse with the source address > being an infected PCs on a dialup pool that has port 25 filtering > enabled. ...description of 'fantasy mail' removed... > > So, a quick poll .. how many ISPs here have noticed this behavior, and > applied bidirectional filters? And if they've applied port 25 filters > bidirectionally, have they noticed any problems with this setup? > I believe reseller contracts have included this for over 2 years now, John StClair's efforts to get these in place are the primary reason they exist for our customers. > This ISP's post is only the second I've seen noting such behavior in a > few months, the first being a nanog post in Aug 2004 by Hank > Nussbacher - http://www.cctec.com/maillists/nanog/current/msg03171.html > We'd first seen this behaviour over 2 years ago... quite a bit actually over that time as the filters had been put into place. -Chris