Changing the From: in the header

Can I change what the recipient sees in the From: line of the header?

I don’t want/need to change the Domain alias, just what the recipient sees on the From: line.  It now seems to default to whatever is in the Name: field when viewing Tools > Accounts > General > Name:.  Currently, I have to go there to change Name: if I want to send an email From: anything other than this default.