[2.1?] "User xx has blocked your personal message."

[SMiFFER]

How does it know who you're sending it to until you hit send?

Simple! When you enter the name in "To/CC/BCC" !!!!!
(Even an autocomplete is there, why not such check?)

[Kindred]

It could perhaps use something ajax'ey to check if the username you have in the receivers list has ****** blocked.
Probably a bad idea though.... speaking of overhead.

[SMiFFER]

Better yet don't even show a send message link if someone has blocked you.

That is the BEST and only logic idea! Well thought!!!

[Bigguy]

Why not instead of a send message link there is a you've been blocked message. Or just blocked text.

[Kindred]

It could perhaps use something ajax'ey to check if the username you have in the receivers list has ****** blocked.
Probably a bad idea though.... speaking of overhead.

[Irisado]

Raising this topic once to post very little in the way of content was just about okay, but twice is pushing the envelope too far, so I'm locking it.