OK, I put up with greylisting for nearly a week, but then got rid of it. Reason? I’m so heavily dependent on speedy delivery of e-mail that I just can’t work with 12 hour delays. Even if greylisting is set for just 10 minute delay periods, most MTAs will wait several hours or even a full day before retrying to send the message. Not good. Too much trouble. Plus some MTAs will send the sender a dangerous looking message stating that there’s some problems with delivery, which gets people agitated. Of course, this only happens once per each person sending mail (in one location), but still it’s too much of a hassle.
But another quite surprising result did occur: the amount of spam I received decreased from 540 spam/day to 440 spam/day. Apparently quite a few spam engines did not like the temporary deny result they got and removed me from their lists. I just talked to my colleague Hans today and he also mentioned that disabling an e-mail account temporarily gets rid of quite a bit of spam. Greylisting achieves the same, without blocking mail from legitimate senders. So maybe enabling greylisting during my holidays and other non-urgent periods would be a good thing…
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