Reverse DNS Lookup (PTR Creation)

[itmt]

Hi,

I have a new Exchange 2003 server on the domainone.local domain.
Exchange sends email out and picks it up via the POP3 connector. The email domain is @domain-one.com

Since installation, lots of emails are being bounced by ISP's as they suspect relaying is taking place which it is not. I undertsand that I need to create a reverse PTR record and know where to create it but am unsure what I should actually create! DO I need a corresponding A Record too?

Plesae, please help!

 

[Marcs41]

In short, since you use POP3, the target of your mailserver is the IP where the mail is stored. When you send an email, there is another IP in it, and that can cause some servers to refuse your mails.
Easiest solution, stop using POP3 and get your own MX.

Marc
_{If 'something' 'somewhere' gives 'some' error, expect random guesses or no replies at all.
Free Tip: The F1 Key does NOT destroy your PC!}

 

[58sniper]

But using a POP3 connector has nothing to do with rDNS.

Have the ISP create a rDNS entry for your public IP address (since they own the address).

Pat Richard, MCSE(2) MCSA:Messaging, CNA(2)

 

[Marcs41]

By itself, you are right Pat, but if the ISP check the senders IP with the current MX, and it differs, some just plain refuse it. You probably know there are always issues using POP3 services, speciallt these days where everyone get more and more alert to spam, phishing, .... you name it

Marc
_{If 'something' 'somewhere' gives 'some' error, expect random guesses or no replies at all.
Free Tip: The F1 Key does NOT destroy your PC!}

 

[itmt]

thanks guys.
Would it also solve the problem by relaying the message via the ISP. That is, not to send via a DNS connector on the Exchange server, but to relay outgoing mail via a connector to the ISP?

 

[Marcs41]

You could use your ISP as SmartHost, yes.

Marc
_{If 'something' 'somewhere' gives 'some' error, expect random guesses or no replies at all.
Free Tip: The F1 Key does NOT destroy your PC!}

 

[itmt]

Thanks - for the outbound security - does that need to be set only at the Routing Group\First Routing Group\Connectors\SMTP Relay Properties ONLY

OR should the authentication also be set at Servername\Protocols\Default SMTP VS Properties.

I know (from my ISP) that I have to use authentication, but I have read conflicting reports on whether it should be set in both locations or second location only?

Cheers mate.

 

[Marcs41]

It's outgoing for you only, so ISP requiring Auth should be just fine.

Marc
_{If 'something' 'somewhere' gives 'some' error, expect random guesses or no replies at all.
Free Tip: The F1 Key does NOT destroy your PC!}

 

[itmt]

Thanks. So, to clarify, only set the authentication details here:

Routing Group\First Routing Group\Connectors\SMTP Relay Properties

 

[58sniper]

Keep in mind that using a smarthost has negative effects on delivery receipts.

Pat Richard, MCSE(2) MCSA:Messaging, CNA(2)