Re: smtp problem: Status: 4.4.7 Unable to contact host
From: John Johnstone (jj_usenet2_at_yahoo.com)
Date: 10/03/03
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Date: Fri, 03 Oct 2003 16:05:15 -0400
sol gongola wrote:
>
> Compaq TCP/IP Services for OpenVMS Alpha Version V5.1 - ECO 3
> on a AlphaServer 2100 4/275 running OpenVMS V7.2-1
>
> So far 3 people have been 'reproducibly' unable to email us. 2 are coming
> from comcast, 1 from worldnet.att.net. No one else from these sites has
> been trying to send us email so i don't know for sure if the sender is
> the problem . The bounced messages all have the same status message:
>
> Final-Recipient: rfc822; SOL@ADLDATA.COM
> Action: failed
> Status: 4.4.7 Unable to contact host for 1 days,
> Diagnostic-Code: smtp; Persistent Transient Failure: Delivery time expired
> Last-Attempt-Date: 1 Oct 2003 21:02:13 +0000
>
> I am using smtp.config but I don't think anything I can put into
> smtp.config could have caused this.
>
> We are not having any problems receiving messages from others.
> Does anyone know what could be causing this.
>
> thank you
> sol gongola
> adl data systems inc
> dobbs ferry, ny
I just tried a telnet to port 25 of mail.adldata.com and there was a
pause of about one minute before I saw the 220 announcement from your
mail server. That would correspond to the timeout for the IP address to
name lookup that your server would be doing. I was coming from an
address that should resolve back to a name but after my HELO test, your
machine's 250 response had "Hello unknown.hostname" in it. It looks
like your system's DNS resolver isn't working. If all of your recent
incoming mail has "unknown.hostname" in the received headers, then I
think that would confirm it.
If your Comcast and ATT mail is coming from their servers and not
directly from one of their users, it looks like they've got poorly
configured servers that have a initial timeout of less than one minute.
At each attempt, their systems are probably giving up before your system
puts out its 220 announcement. Any system that has a timeout of more
than a minute will still get through.
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