Today I mainly received...

I have a number of domains, most of which aren't really used, but I do have three in regular use and their email goes through a server side spam filter. The result of this is that when I check the spam filter each day I often see hundreds of exactly the same spam trapped there all sent to the same handful of addresses dozens of times.

Today's spam made me laugh...

Dear Customer,

This e-mail was send by myowndomain.com to notify you that we
have temporanly prevented access to your account.

We have reasons to beleive that your account may have been
accessed by someone else. Please run attached file and 
Follow instructions.

Ignoring the fact that I run my own domains and am effectively the admin for their email, etc., how sensible would it be to email someone telling them you had blocked access to their email?