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 "firstname.lastname@example.org" /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?