IP drop list

[Jim Pazarena]

I wonder if there is an easy way to provide dovecot a flat text file of 
ipv4 #'s which should be ignored or dropped?

I have accumulated 45,000+ IPs which routinely try dictionary and 
12345678 password attempts. The file is too big to create firewall 
drops, and I don't want to compile with wrappers *if* dovecot has an 
easy ability to do this. If dovecot could parse a flat text file of IPs 
and drop connections it would sure put a dent in these attempts.

Thanks.