HowTo Test a Mail server BEFORE going live

Use the Wormly website to test email deliver either before going live with at new mail service or if there are problems.

If you are setting up a non-profit using Microsoft Office 365 non-profit free service, you need to “Purchase” the licenses for $0 and assign them to users before you can deliver any email as listed above.

Side Note:
Microsoft does not allow email forwarding until you turn it on

reverse test tool here