North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Abuse procedures... Reality Checks
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
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