Returns Email of the sender, if found.

A String value.  

object.FromEmail

The FromEmail Property syntax has these parts:

FromEmail property will read sender of the message (through From property), and try to return only email address, without the name.

Typically, full sender header may look like this:

"Technical Support" <techsupport@weonlydo.com> 

in which case FromEmail would return 'techsupport@weonlydo.com', without any quotes. To retrieve name, you can use FromName property.