mail getting returned/ip name lookup failed

[sde]

Hi,

On a domain I have mail being returned to sender by some ISPs.

Reason: Relaying denied. IP name lookup failed for 1.2.3.4

Do I need to add a PTR or CNAME record or something to the main host DNS?

 

[sde]

nevermind, refined my searches to DNS and found the answer. i need to have my provider setup a reverse dns record.