nanog mailing list archives
Re: Port 25 filters - how many here deploy them bidirectionally?
From: Suresh Ramasubramanian <ops.lists () gmail com>
Date: Mon, 10 Jan 2005 07:23:01 +0530
On Sun, 9 Jan 2005 14:51:31 -0500 (EST), Sean Donelan <sean () donelan com> wrote:
On Sun, 9 Jan 2005, Suresh Ramasubramanian wrote: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?Have you looked at the following :-) http://www.outblaze.com/main.php?id=antispam&page=anti_infoadmin
I wrote some part of that doc (though the part about filtering you quoted seems to have been written by a colleague) - you'll find docs all over the 'net, that have a lot more detail. Finding out how many ISPs are doing this is a rather different thing from finding out how many docs out there are recommending it. Especially as I'm seeing a marked uptick in this sort of behavior, from ISPs that I thought normally do filter port 25. As John points out earlier there were cases of specific people doing this, though now I think we're seeing trojans do it - a rather more dangerous development. --srs -- Suresh Ramasubramanian (ops.lists () gmail com)
Current thread:
- Port 25 filters - how many here deploy them bidirectionally? Suresh Ramasubramanian (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Subhi S Hashwa (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 25)
- Re: Port 25 filters - how many here deploy them bidirectionally? Subhi S Hashwa (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Bob Martin (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Christopher L. Morrow (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? John Levine (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Patrick W Gilmore (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Sean Donelan (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Suresh Ramasubramanian (Jan 09)
- Re: Port 25 filters - how many here deploy them bidirectionally? Todd Vierling (Jan 10)
- Re: Port 25 filters - how many here deploy them bidirectionally? Joe Rhett (Jan 11)
- Re: Port 25 filters - how many here deploy them bidirectionally? Todd Vierling (Jan 11)