Recently I start getting about 100,000 SMTP connections per day from spammers trying to send messages to non-existing users in my domains. It takes my network bandwidth and even worse, it fills up my disk with smtp server logs :)
Because of that I've decided to start blocking SMTP connections from the ips that have tried to send a message to non-existing user more than 100 times. If you could not send me a message then: 0) check the blocked ips list [1] to make sure that it is the reason; 1) stop spam from your smtp server; 2) contact me using some other smtp server to remove that ip from blocked list. Other simple options is to just use another smtp server :)
Sorry for inconvenience, Aleksey
[1] http://www.aleksey.com/blocked-smtp-ips.txt
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