North American Network Operators Group
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Re: DNS Hijacking by Cox

  • From: Florian Weimer
  • Date: Mon Jul 23 02:26:21 2007 
* Sean Donelan:

> On Sun, 22 Jul 2007, William Allen Simpson wrote:
>> Comcast still blocks port 25.  And last week, a locally well-known person
>> was blocked from sending outgoing port 25 email to their servers from her
>> home Comcast service.
>
> MSA port 587 is only 9 years old.  I guess it takes some people longer
> than others to update their practices.

You missed the "to their servers" part (I don't think it's singular
"they" 8-).  At the intra-ISP level, submission vs. SMTP does not
really matter because it's all local policy.  If they block her on
25/TCP on their own servers, they can easily block her on 587/TCP,
too.