hi,

theyre reffering to the reverse lookup... thats how servers get 
hostnames by looking at the reverse dns of the ip that connects to them.
some mailservers are a bit too paranoid and dont allow clients without 
out reverse mapings or records that dont match their forward and reverse 
lookups... conforming to some RFC

Andre John Cruz wrote:

>hi people,
>
>this isn't linux only, but i'm encountering problems sending to some servers
>running sendmail. it seems like they can't see our domain because it says
>"sender domain must resolve."
>
>i wonder what gives? our domain is a valid domain (otherwise, plug mail
>won't be able to reach me, right?). i just don't know if there's any
>misconfig in our DNS servers that's causing this...
>
>thanks,
>-andre
>
>
>
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