nanog mailing list archives
Re: Charter blocking Port 25
From: Jeroen Massar <jeroen () unfix org>
Date: Thu, 10 Jun 2004 17:26:35 +0200
On Thu, 2004-06-10 at 16:28, Todd Vierling wrote:
On Wed, 9 Jun 2004, matthew zeier wrote: : But this is different - I'm not running a mail server -on- my Cox : connection. I'm running one external to Cox but I can't connect to : port 25 on it. That's why port 587 was invented. It's the MSA (mail *submission* agent) port, intended only for initial injection of mail into the SMTP delivery network. Learn it, believe it, use it. 8-)
Mail *SPAM* Agent? ;) when spammers also start probing for that port... A site that has a bad port 25 policy also will likely also have a bad MSA policy. MSA's can also be open relays just like standard port 25. Splitting submission from transfer seems like a good idea though, but in the light of good MTA's, so that the MSA don't need to add a handfull of headers and also SMTP-AUTH and TLS it doesn't make much difference. Requiring *Authentication*, may that be on 25 or 587, is the way to go here... but then still that 'neighbor' will have a misconfig and spam straight away. Not even talking about the bots. Greets, Jeroen
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Current thread:
- Re: Charter blocking Port 25, (continued)
- Re: Charter blocking Port 25 Matthew McGehrin (Jun 09)
- Re: Charter blocking Port 25 Deepak Jain (Jun 09)
- Re: Charter blocking Port 25 W. Mark Herrick, Jr. (Jun 09)
- Re: Charter blocking Port 25 Gregory (Grisha) Trubetskoy (Jun 09)
- Re: Charter blocking Port 25 Richard Parker (Jun 09)
- Re: Charter blocking Port 25 Gregory (Grisha) Trubetskoy (Jun 10)
- Re: Charter blocking Port 25 J.D. Falk (Jun 09)
- Re: Charter blocking Port 25 matthew zeier (Jun 09)
- Re: Charter blocking Port 25 John Payne (Jun 09)
- Re: Charter blocking Port 25 Todd Vierling (Jun 10)
- Re: Charter blocking Port 25 Jeroen Massar (Jun 10)
- Re: Charter blocking Port 25 Todd Vierling (Jun 10)
- Re: Charter blocking Port 25 Michael Loftis (Jun 09)
- Re: Charter blocking Port 25 Henning Brauer (Jun 10)
- Re: Charter blocking Port 25 Konstantin Barinov (Jun 10)