{Disarmed} Re: Listen on different port

Anthony Cartmell ajcartmell at fonant.com
Mon Jan 7 17:57:26 GMT 2008

>> Will it also accept mail on port 587 or is it just for submission?

Port 587 is for mail submission as per rfc2476. It's designed to allow for  
different handling of submitted mail (which may often be relayed to  
another domain) compared to relayed mail (which is often only accepted for  
local domains).

> You really should relay out through your ISP's mailserver.

IMHO it's perfectly OK to use another mailserver. I use Zen Internet as my  
ISP, but send all outgoing mail through my own mailserver (and  
MailScanner!). Using port 587 means that I can do this from anywhere, not  
only my home broadband connection, and even from ISPs that hijack port 25.

On my servers I enable port 587 in sendmail simply by adding "dnl" to  
comment out the "no_default_msa" line in sendmail.mc, as below:

dnl FEATURE(`no_default_msa', `dnl')dnl

I require authentication for anyone wishing to relay to other domains, for  
connections on ports 25 and 587.


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