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Forum Discussion

Terry_Rodecker_'s avatar
Terry_Rodecker_
Icon for Nimbostratus rankNimbostratus
Sep 22, 2016

GTM, WideIPs, and MX Records

We've been using GTM successfully for a couple of years to load balance simple web sites across multiple data centers. Our appliances are actually combination LTM/GTM appliances as we use the LTM po...
BIG-IP
security
Niels_van_Sluis's avatar
Niels_van_Sluis
Icon for MVP rankMVP
Sep 23, 2016

I don't think the MX records for your incoming SMTP servers have to match the IP-addresses that are used for systems that are sending mail. It's true that most SMTP servers will do a reverse lookup for systems that try to deliver them mail as one of the many checks to prevent accepting mail from a malicious source, but it has nothing to do with the MX records. These are only used for incoming mail.

 

Also check your SPF records if you are using them. Make sure these are matching the servers that are known to send mail for your domain.