[95950] in North American Network Operators' Group
Re: Abuse procedures... Reality Checks
daemon@ATHENA.MIT.EDU (Leigh Porter)
Thu Apr 12 05:21:20 2007
Date: Thu, 12 Apr 2007 10:17:42 +0100
From: Leigh Porter <leigh.porter@ukbroadband.com>
To: Mikael Abrahamsson <swmike@swm.pp.se>
Cc: nanog@merit.edu
In-Reply-To: <Pine.LNX.4.64.0704120822230.28703@uplift.swm.pp.se>
Errors-To: owner-nanog@merit.edu
Mikael Abrahamsson wrote:
>
> On Wed, 11 Apr 2007, Frank Bulk wrote:
>
>> It truly is a wonder that Comcast doesn't apply DOCSIS config file
>> filters
>> on their consumer accounts, leaving just the IPs of their email servers
>> open. Yes, it would take an education campaign on their part for all
>> the
>> consumers that do use alternate SMTP servers, but imagine how much
>> work it
>> would save their abuse department in the long run.
>
> There are several large ISPs (millions of subscribers) that have done
> away with TCP/25 altogether. If you want to send email thru the ISPs
> own email system you have to use TCP/587 (SMTP AUTH).
>
> Yes, this takes committment and resources, but it's been done
> successfully.
>
You don't even need to do that. We just filter TCP/25 outbound and force
people to use our mail servers that have sensible rate limiting etc.
People who use alternate SMTP servers can fill in a simple web form to
have them added to the exception list. We have about 50 on this list so far.
--
Leigh Porter
