John Weller wrote:

>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED] Behalf Of Brian Erickson
>> Sent: 06 November 2007 16:49
>> To: [EMAIL PROTECTED]
>> Subject: Re: SMTP error
>> 
>> is the ISP blocking port 25 to the smtp server.  I know that comcast 
>> does that.

 > Thanks - I'll check with the ISP in the morning.

Don't bother calling the isp and wasting your time until you've found 
out if the isp is indeed blocking port 25. Find out by opening a command 
window and issuing:

"""
c:\>telnet mail.paulmcnett.com 25
Connecting to mail.paulmcnett.com...Could not open connection to the 
host, on port 25: Connect failed
"""

Okay, so my ISP (AT&T DSL) is blocking port 25. Actually, it could be 
one of my firewalls but I happen to know that isn't the case.[1] Point 
being, I can't get out onto the internet on port 25 (smtp).

If I had gotten out, I'd have seen:

"""
c:\>telnet mail.paulmcnett.com 25
Connecting to mail.paulmcnett.com...
220 mail.paulmcnett.com ESMTP Postfix
"""

If you find that your isp does block port 25, your options include 
setting up a relay smtp server. I've set one up for my use, that listens 
on port 8025 (try telnetting to mail.paulmcnett.com 8025). This allows 
certain clients of mine behind restrictive isp's to still have 
mailservers in-house that relay over 8025 to my server that actually 
sends the mail.


[1] If I didn't know that was the case, I'd bring my laptop over to the 
dsl router, and plug it in directly, and then I'd go to my OS's firewall 
and temporarily disable it, and try the telnet test again.

-- 
pkm ~ http://paulmcnett.com


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