|
North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Charter blocking Port 25
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 Attachment:
signature.asc
|