Small sendmail prob

I'm a n00b, I'll admit, but I'm having trouble with my sendmail now, and it was working fine a couple weeks ago.
I really don't know what to make of this error so I was wondering if you could translate it for me and help me out if possible, thanks Small sendmail prob


< 250 www.kaytwo.com Hello [64.21.143.22], pleased to meet you
> MAIL FROM:<k2rbka@attbi.com>
< 250 2.1.0 <k2rbka@attbi.com>... Sender ok
> RCPT TO:<k2rbka@kaytwo.com>
< 450 4.7.1 <k2rbka@kaytwo.com>... Relaying temporarily denied. Cannot resolve PTR record for 64.21.143.22

 

 

 

 

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