> From: Jeff Lasman > One > of our users has suggested we delay all inbound messages on port 25 by three > seconds to help eliminate spam.
> # Accept hosts who are polite enough to wait rather than just send, as > spammers do Exim already does that by default. Read description of the smtp_enforce_sync main configuration option, then telnet to Exim, you'll see 3 seconds delay between connection and SMTP banner. If a spambot or an abused proxy tries to send HELO before the banner, Exim drops the connection. Check how many messages in logs containing: SMTP protocol synchronization error (input sent without waiting for greeting): rejected connection from > # Accept hosts who are polite enough to wait rather than just send, as > spammers do > accept hosts = * > delay = 3s > > # Deny hosts who don't wait > deny message = Too quick on the draw - to unblock wait for helo/ehlo This "deny" is never reached. -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
