RE: att.net email issues?

["Jack McCarthy " <Lists () jackmccarthy com>]

One of my clients is having this exact problem as we speak.  Their MX record lists the correct domain name and IP but 
when they send mail out, the domain name stays the same but the IP is different.  The public IP, not the MX record IP, 
gets associated to the email.  I'm wondering if is the cause... 


--- Andy Dills <andy () xecu net> wrote: 
> Date: Fri, 24 Jan 2003 12:01:34 -0500 (EST) 
> From: Andy Dills <andy () xecu net> 
> To: Jim Popovitch <jimpop () rocketship com> 
> CC: nanog () merit edu 
> Subject: RE: att.net email issues? 
>
>
> > On Fri, 24 Jan 2003, Jim Popovitch wrote: 
> >
> >
> > Chris at UUNet help determine this is a rDNS issue.  att.net seems >> to have started rejecting email from mail 
> > servers that don't have a >>proper reverse DNS entry.  This is a good thing, even though it is >>causing me some 
> > problems at the moment.  Thanks Chris. 

> Hah! That'll last all of about three days. 
>
> At least, that's how long it took for my users to line up outside with 
> pitchforks and shotguns...we quickly removed that check from being the 
> default behavior and added it to our most aggressive filtering 
> configuration (for those users who, like me, just don't give a damn >about getting mail from people who can't take the 
> time to configure >reverse DNS.) 
>
> Andy 
>
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> Andy Dills                              301-682-9972 
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