RE: [cobalt-users] Sendmail relaying denied error

["Dan Kriwitsky" <list1@xxxxxxxxxxxxxxxxxxxx>]

> 
> > Relaying denied. IP name lookup failed [208.144.236.130]
> 
> >Plus you "need" reverse DNS since your own server said so (see line 
> >above).
> 
> Will reverse DNS work if server is based on multi domain on 1 
> IP address?  Are you speaking of setting up a PTR record? It 
> does not make sense that deleting and recreating the site 
> fixes the issue, if it is a relaying error.  It also does not 
> make sense that 34 domains work and this one does not.  I saw 
> this in the discussion forums that someone else has similar 
> symptoms but no domains are accepting messages.  It was a 550 
> also that had the issue. 
> 

Reverse DNS will not affect your email in this case. If you hadn't
removed and recreated the site, you could have found the missing entries
in virtualusertable which were probably caused by a missing email alias
in your site settings. The IP name lookup above was the IP trying to
send to your domain and since it wasn't local it wasn't allowed. If
email failed because of no rDNS the Internet would come crashing down.

Here's the identical error from a domain in my DNS only with no site or
email alias.

Mar 17 23:49:48 admin sendmail[14252]: h2I5nlH14252: ruleset=check_rcpt,
arg1=<anyone@xxxxxxxxxxx>, relay=smtp-out.comcast.net [24.153.64.116],
reject=550 5.7.1 <anyone@xxxxxxxxxxxx>... Relaying denied.  Please check
your mail first or restart your mail session.
-- 
C2003 Dan Kriwitsky

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