Microsoft has shared updated requirements for SMTP relay via its Exchange Online platform. The new updated requirement is not applicable yet and is set to roll out towards the end of the year.

I've configured our internal Exchange servers to relay outbound mail through a proxy/firewall. <BR><BR>I've noticed that the headers on external emails contain the private IPof the internal mailserver ...

A new SMTP header developed by Facebook and Yahoo confirms ownership of Yahoo email accounts. Yahoo’s decision in June 2013 to reset accounts that had been dormant for 12 months and make them ...