Hi all,
I am about to migrate to Office 365, and I just realized that many times when vendors switch email servers, they send out emails with the new mail server, domain, and IP to clients so the clients can ensure they are whitelisted by their respective IT departments.
The sending mail server is mail.office365.com, and obviously I know our domain, but where can I find a list of IP's of the outboundservers for O365? I would like to craft the email so our account reps can send it out with all information possible to avoid any spam filters blocking us