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Re: question about PTR records
From: Len Conrad
Date: Tuesday, October 30, 2001
Time: 11:05:03 am
>hello folks,
hello folk,
>one of my clients was having trouble with some of his mail not being
>deliverable. we narrowed it down to a dns issue.
which is? specifically, what was the SMTP 4xx or 5xx response code and
text for the rejected mail?
> i ran a dns report and
>got this error.
>
>---------
>ERROR: None of your mail server(s) seem to have reverse DNS (PTR)
>entries (I didn't get any responses for them). RFC1912 2.1 says you
>should have a reverse DNS for all your mail servers. It is strongly
>urged that you have them, as many mailservers will not accept mail from
>mailservers with no reverse DNS entry.
>---------
very few mail servers reverse the sending MTA's ip. too many false
positives. but you should have the reverse for your sending MTA set up.
>Does the PTR record go in the domain zone or the in-addr.arpa zone?
PTR records go in the reverse zone, not the forward zone.
Len
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