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Mail Delivery Failed

I have an SG320 that I have just setup to use as an SMTP proxy server with SPX encryption.

I setup my exchange 2010 server send connector to route through the smart host (SG320 IP address) and do not have any smarthost settings setup on the firewall.

I'm receiving SMTP bounce backs from a few domains today that say I don't have a reverse DNS entry or that i'm being blocked because of the email looking like it's coming from the firewall.

Am I missing a step in the SMTP proxy setup now that mail is being routed through the FW proxy server?

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0 rrosson over 9 years ago

Depending on your network configuration you will need to make sure your public IP that is in use for your mail server (assigned to the UTM) has a reverse DNS entry. MXToolbox (MX Lookup Tool - Check your DNS MX Records online - MxToolbox) has an easy interface to verify/validate any issues you might have with mail.

Hope This helps.
-Ron
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0 rrosson over 9 years ago

Depending on your network configuration you will need to make sure your public IP that is in use for your mail server (assigned to the UTM) has a reverse DNS entry. MXToolbox (MX Lookup Tool - Check your DNS MX Records online - MxToolbox) has an easy interface to verify/validate any issues you might have with mail.

Hope This helps.
-Ron
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0 Jurgy over 9 years ago in reply to rrosson

Do i need to modify the public IP address of my mail server at my DNS host and make it the IP address of my firewall now that it is acting as a proxy server?

Once i made the change on the exchange server to remove the smart host on the send connector from the SG320 everything works fine.
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