in each individual email page at the top, but under the address and subject line, you see the from window has the double arrows- up and down..you can click on them and the list of usable email addresses to send FROM drops down. Select the one you want to use as a FROM.
It may be a bit of effort required to do, each and every email- but if it bothers you....
But hten, come to think of it, I have seen, probably in mail>preferences, a place to choose the return address- one selection is alternate at random or such... Or you can designate... then log in, designate and send away, and let your husband worry about lowering the seat, as it were...
I just looked: mail>peferences>composing