I am currently running a Hybrid setup with Office 365 and my on premises Exchange server 2007.
Almost all of our Mailboxes have been migrated to the Office 365 but my MX is still pointing to my On Premises Exchange server 2007.
Today I went to MXtoolbox.com just to check on my status and found out that I have a SMTP Reverse DNS Mismatch which can cause some issues on incoming and outgoing emails to external companies.
The message says: "Warning - Reverse DNS does not match SMTP Banner"
Does this pertains to my PTR record?