Looking for a script to group grep results for my maillog

[smithaa02]

Basically, I'm worried that a spammer is targeting one of our mail accounts and I would like a way to check the maillog for which email accounts are receiving the most recent mail.

I can do:

grep -c "sample@somesite.com" /var/log/maillog

Which works great for that email account, but unfortinitly I have 1000's of email accounts, and I don't have the time to do this for every account, and then find which account was receiving the most email.

Is there a way use something like grep -c, that will allow me to group results by email address sorted by which email account in /var/log/maillog is receiving the most emails?

[anomie]

Could you post a few lines from that log (including lines that contain the email address as you've described)?

I have some ideas but need to see how the file is laid out first.