Does anyone know how to expedite Outlook email tests? The same test emails are delivered swiftly to other email clients.
Marketo has no awareness of what client(s) will used to read a client.
So if you're seeing delays on Send Sample that's because of the receiving mailserver applying some sort of delay, like greylisting, et al.
Unless you're talking about an actual service, like 250 OK?
Also, this thread is in the wrong place (I shouldn't have answered here). Please move it to Products: https://nation.marketo.com/t5/Products/ct-p/products
"University" is not a support space.