Quoting Marc Sherman: >> Even if you know positively that the sender is a spammer, their SMTP >> service will keep reconnecting over and over for each additional >> message (if dropped at MAIL/DATA) or recipient (if dropped at RCPT) >> that is still queued. > That's true for real SMTP servers. It's false for most zombie farms, > which typically run broken hacks that only vaguely resemble an SMTP server.
True today, but I think they will evolve eventually, so other methods like greylisting (which I also use today on suspicious hosts) will also get useless. Dropping connections immediately is quite cheap (even more with rejecting the connection on your firewall), but then one should be very sure the sender is a zombie. -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
