>I want to prepare for the time when most mail systems require a reverse dns
>pointer record.
It's rumored that AOL will silently delete mail from mail servers without a
reverse DNS entry, so now may be the time. :)
>Will it be sufficient to set up a reverse pointer record for arriba1.net OR
>will I ALSO need to ask my hosting customers to change their smtp to
>something like mail.arriba1.net
You can keep the forward DNS the same, so customers won't have to change
their mail settings. You just need to add a PTR record for the IP address
of the mail server, so that it returns "mail.arriba1.net" (or whatever the
actual host name of the server is).
>Today, when sending mail from roy.com to say..hotmail, the ip address in
>play is their hosting ip address.
>
>For example, when sending from arriba.net (not arriba1.net), some systems
>try to do a look up on 216.147.198.2 which is a shared host header ip
>address that many sites uses. That ip address is not the arriba1.net ip
>address.
Well, that's the IP address that IMail is using to send the
mail. Otherwise, those servers won't look up on it. I've never heard of
any type of mail server or other program that will receive a connection
from one IP, and do a reverse DNS lookup on another.
>I don't see how i could set up reverse records for each mail domain when
>they are sharing an ip address.
You don't have to. You just need to make sure that each IP address that
can be used for outgoing mail has one reverse DNS entry. It should be the
host name of the mail server, and does not need to match the domain of
outgoing mail. So you can host lots of domains on one IP, and have just
one reverse DNS entry.
>So, the alternative i see is to ask my my customers to change their smtp
>servers in their mail client to mail.arriba1.net and then put in a host
>alias of mail.arriba1.net in each of their imail configurations..
There's no need to do that.
>Oh, and also change their dns record mx records to reflect mail.arriba1.net.
That isn't necessary either.
Just one simple PTR record for each IP address you'll be sending mail from
is all you need.
-Scott
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