>You're right. I've seen very few of such servers. But still, they exist. You
>know, it's very difficult to explain your client why his messages are
>rejecting by particular server while others are able to send messages there.
I'd just explain to my client that the domain they are sending mail to is
getting more mail than they want, and so they are rejecting a lot of
mail. It's quite true.
>So I think it's nothing wrong to have a PTR, anyway...
I definitely agree. In fact, we have an automated message in replies we
send that lets people know that their mailservers are missing a reverse DNS
entry, in an attempt to educate them.
> > A lot of people have multiple PTR records, but virtually all reverse DNS
> > tools only look at the first entry, so having just one reverse DNS entry
> > is the best practice.
>
>So what's the reason they keep multiple records?
Because they don't know better, I would guess. Most likely, they think
they need to, or there will be some benefit that there really isn't.
-Scott
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