They need to nab the asshole sending out:
Where did <name> go?
Tell <name> not to come over
Why did <name> show up?
Did <name> also sent you this?
Is <name> leaving him?
<name> is going in July
When will <name> call?
<name> said leave tomorrow
<name> said hi
<name> told me about this
Is <name> telling<name>?
etc... I've received many multiples of these with various names inserted in the <name> spot.
