Unfortunately, I had to add someone to my blacklist, in order to not receive any more rude message from him/her.

But now I have a doubt. If this person tries to message me, does he/she now that is blacklisted? If this person sent an alert about being blacklist by me?

thanks,
Gregorio Morales

aaarg, excuse my bad typing. The correct formulation is:

"If this person tries to message me, does he/she know that is blacklisted? Is this person sent an alert about being blacklist by me?"