[Dovecot] set delay between pop3-logins

I'm using dovecot 1.1.8 on a raq4 server running centos 4.8 Is it possible to set a time delay between all dovecot pop3-logins? say 20 - 30 seconds for example? My reason is I want to thwart the constant login attempts from hackers hunting for an open relay. It's no good blocking the ip address because every hack attempt comes in from a different address. I'm the only user on the server so no-one else would be affected by such a delay. Thanks for any pointers

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