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SMTP --cannot send mail, I get Event Id 4006

Posted on 2004-10-14
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Last Modified: 2008-01-09
I installed SMTP service and I am unable to send any mail either internally or externally.  I even created PTR records in DNS.

Message delivery to the host 66.218.86.199 failed while delivering to the
remote domain yahoo.com  for the following reason: The connection was dropped
by the remote host.

i searched Microsoft's site for that error but I can't find anything.


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Question by:xxsubz78x
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by:JammyPak
ID: 12309862
try sending to another domain to see if that works. reason is, there's a dns/firewall problem that can occur with 2003, and it affects sending mail to certain domains - yahoo being one of them.
this is the link -  it *may* be the problem
http://support.microsoft.com/default.aspx?scid=kb;en-us;828263

also, you say you created ptr records, but did you create them in the public reverse-lookpup zone for your address range? usually the isp controls the reverse lookup zones, since they control the addresses, so you need to get them to add the ptr records for you
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by:xxsubz78x
ID: 12310196
Like I was saying in my 1st message, I already tried sending to different domains.  (internal and external).  I created the PTR records in the public lookup zone.  We don't have an ISP that we go through for DNS, we host our own....(public education  (k-12)  ).
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by:nalanbar
ID: 12313131
What happend if you try to telnet, from the mail server, to the desired domain, on port 25?try this from the cmd prompt     "telnet mail.adelphia.net 25"
tell me what you get
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by:JammyPak
ID: 12318955
to test if it's a PTR issue, try sending to someone's hotmail account - hotmail doesn't check for valid reverse-lookups on the senders.

if that mail still doesn't go through, then it's not a reverse-lookup problem...
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by:xxsubz78x
ID: 12340198
when I tried to "telnet mail.adelphia.net 25" I get
could not open connection to the host: connect failed

I made sure that the Internet Connection firewall is not on...I went to Network connection --> Lan--> Properties and clicked on Advanced and it's not on.  

Is there any firewall that Win 2003 has built in to it?

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by:nalanbar
ID: 12340569
Can you nslookup mail.adelphia.net, and then telnet to the ip address, so that we are sure it ins't a dns error (not that I really think it is)
It looks like your SMTP is gettting dropped somewhere, you could try running the internet and mail wizard from the setup again,
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by:xxsubz78x
ID: 12340745
Actually I think I got the problem solved.  Our Cisco firewall was dropping everything on port 25 except for legitimate mail servers.  I just had to add that server to the Allow list.  Thanks for your help though.
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by:nalanbar
ID: 12340803
Ok.
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