Np.
" Wouldn't anyone be able to decompile it and just look at the domain it's being sent to, and just check it's ip and hack it?" sounds like you're worried about getting caught, not catching someone else. imo.
"If somebody stole my key and I could see what domain it went to, there must be a way I could do something to get it back."
Yes, there is (maybe?), but 'hacking into the email server' is easier said than done :/ i don't even..
(unless the .exe has username and password saved in it..then obviously it's easy to log in)
Assume you see 'keyhacker124@gmail.com' in the .exe --> now you're going to hack @gmail.com, afaik, no.
See ya.