[tkmd]

I was writing a letter and mistakenly put in the wrong email address and sent the letter - of course to have it returned to me. I have since corrected the mistake but every time I put in his email address, mail jumps to giving me two options- the wrong address and the correct one; is there a way to force Mail.app to erase the old email address from its memory so it doesn't pop up again?

[Naplander]

yep.

go to the window option in mail >> previous recipients >> then remove said address from the list.