I use an email address with myregisteredsite.com - an email provider attached to my domain name - and I've connected it to my outlook.
For some reason when I send emails its sending from a long numbered and lettered outlook again address: eg. [email protected]
This is really hard to describe because it's other people's emails bouncing back when trying to email me at the correct email address
We're a church/business and a few people (that I know of) are emailing us and then having their emails bounced back - then they try again to let me know...