It's thank you letter time for Christmas presents and hospitality.
Literally every letter I've received has been addressed to "Mrs John Smith" or, at best, "John and Jane Smith". (Well, not quite, but you get the picture).
I've been married for years; my friends and family all know I didn't namechange upon marriage. So why do they insist upon using my married surname?
And AIBU to find it, well, downright rude of them to simply disregard my personal preference? I'd never address a letter to a married woman who'd taken her husband's surname by her maiden name, so why do these women think the same courtesies do not apply when addressing those women who haven't namechanged?