...exactly like the "you have a pending trade request" pop-up.
"Your trade was accepted." Same link.

Currently kinda guesswork and well, work (menu dropdowns, tracking cap whatever, checking current draft pix etc) as it is to see if a trade was accepted.

Not sure if this is an email option. If it is, it's not enough.

edit: no, I don't want to check league forums to find out.