RE: [cobalt-users] Sendmail relaying denied error

["Tolentino, Elmer" <etolentino@xxxxxxxxx>]

INRE RE: [cobalt-users] Sendmail relaying denied error:
> >For one thing none of your IP seem to have "reverse" DNS.
> >
> >mail.arthur-lerner.com relates to 208.144.236.201, but
> >208.144.236.201 does not... (and neither does 208.144.236.130).
> >
> >I just sent a test email to the address in your message
> >(elmert@xxxxxxxxxxxxxxxxx) and it was at least delivered to IP
> >208.144.236.201.  Be interested to see if you actually get it.
>
> It works now because I deleted the site and re-created it.  But why
> would I have to do this for this domain.  All the other domains work
> fine.  Why do I need to have "reverse" DNS setup.  When someone sends an
> email to this domain it should query the remote DNS hosting's nameserver
> then see that the MX record is pointing to 208.144.236.201 and then the
> mail server should be able to route it to a user from that domain.

>Elmer,

>  You "need" reverse DNS since about  one-third or better of the current 
>"internet" will not talk to your servers if they do not have reverse DNS 
>(since the majority of spammers come in from machines/servers without reverse 
>DNS).

I see.  I have heard of instances where mail was rejected because, the hosting company we were hosting, had reverse DNS going to nameserver.com but when you ping it, it had a different ip address.

> 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. 

>Do not have a 550 so cannot help further than that...

-- 
Larry Smith
SysAd ECSIS.NET
sysad@xxxxxxxxx

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