Having a small problem with e-mail

Me again. When I try to e-mail an invoice it sometimes wont go, and it just says error without any explanation.
Also is it possible to sync this up to my regular e-mail address so that people only see my name when they look at the senders name. This issue will be the decider for me to choose to carry on wuth this other wise great system.
know I’m a bit dumb, but I am old.
Please help

Manager won’t remember your email preferences yet so this is something I need to work on sometime next month.

Regarding errors, I’m planning to make error messages more verbose so you can easily see why email could not be sent.