Among other things, I run my own mail server for a few domains. On those domains, I use a method of combatting SPAM called greylisting. Basically, when another server wants to deliver mail, my server says “I’m too busy – try again later.” A valid mail server will still be around later to retry. A typical spammer’s ad-hoc server (that’s usually on a hijacked machine) won’t bother to try later even if it’s still around to do so.
In order to receive some time-sensitive mail recently, I turned greylisting off on a particular domain for the last 24 hours or so. The result was dramatic. Read More »
bryn --verbose 
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