Our inbound email server keeps rejecting Freshdesk email addresses as it thinks they are spoofs. I don't want to disable spoof protection for our support email, because we do often get incoming spoof email.
What I would like is some way of whitelisting the Freshdesk email servers.
I have looked at the hostnames, but they seem to be sent from a different hostname each time (I've seen, among others, mail-us37.freshemail.io, emailus.freshdesk.com, mail-us7.freshemail.io, o19.email.freshdesk.com...).
Is there a list somewhere of the IP addresses and hostnames that Freshdesk use so that I can upload them into our mail server?