[OT] does deliveragent must have a PTR RR

pyh at mail.nsbeta.info pyh at mail.nsbeta.info
Tue Feb 1 03:25:35 UTC 2011

Hi list, 

I can't setup a ptr RR for my mailserver's IP.
Here the main ISPs who are owned by this garbage state take expensive price 
for setup a reverse record for a public IP. It's about 30 USD each month 
for each IP.
But some MTAs does require the peer deliveragent has a PTR RR,like AOL's 
email systems.
Is there a special RFC for this requirement? 


Mail Delivery System writes: 

> This is the mail system at host mail.nsbeta.info. 
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below. 
> For further assistance, please send mail to postmaster. 
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message. 
>                    The mail system 
> <donovan at beth.k12.pa.us>: host mx1.beth.k12.pa.us[] said: 450 4.7.1
>     Client host rejected: cannot find your reverse hostname, []
>     (in reply to RCPT TO command)

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