[dmortin]

In this case it's better to remove that person from the contact list, isn't it? He knows in both cases he is ignored, but if he's removed as a contact then he at least knows he shouldn't send messages in vain.

[kakarot]

That seems more extreme than just becoming less than friends. Why tarnish a good rolodex? A contact list isn't a friend list.

[scarcely]

Rolodex? What's next, a Filofax?