https://forums.elderscrollsonline.co...1-gold-in-mail
https://forums.elderscrollsonline.co...ld-spam-attack
I found these two postings. I swear I read something on the forum within the past few weeks that someone had experienced something very similar. I recall people in the comments saying not to accept the gold and to report them. But unfortunately, I can't find the post. Maybe I read it on reddit?
Sorry I couldn't be of more help.