Hi All, I have question regarding reverse lookup. I have static IP for receiving emails (MX -> 78.38.2.8), however, My hub transport is using other IP address (78.38.2.9) sending mails. which is also static for internet access. My mx records are inbound.domain.com ->78.38.2.8. Explain me how to configure reverse lookup, for MX record->78.38.2.8 or sending mail IP ( 78.38.2.9). or what is the best practise Thanks Uday Kiran, Senior Consultant Cyquent Technology Consultants, Dubai Please Mark as answer if it helps you

should use sending IP 78.38.2.9Sukh

thanks sukh. One more question related to this. I have mx record of inbound.rgpc.com pointing to public IP and email address of adc@rgpc.com. so wheni configure reverse look up, i have to configure sending mail (78.38.2.9) resolve to rgpc.com right ?Thanks Uday Kiran, Senior Consultant Cyquent Technology Consultants, Dubai Please Mark as answer if it helps you

valid PRT record should be the source SMTP server's IP address. the one you are using for sending (78.38.2.9) then cofirm your settings from http://testexchangeconnectivity.com and check outbound emial Thank you Dhruv

yes. MX points to your incoming mail server IP 78.38.2.8. . Outoing is 78.38.2.9. Use this for PTR.Sukh

Hi, Valid PTR record is the source SMTP server’s IP address on the public DNS server. So PTR record should point to your external (outbound mail IP: 78.38.2.9). Hope this helps. ThanksPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.