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Happy new year too !
So, here are a few questions about greylisting.
1) Is greylisting effective any more ?
In looking over a lot of our SmarterMail SMTP logs the past few weeks, I have notices that some of our spammers, do not just "retry" but are profoundly persistent. We have a few spammers, that basically have their servers BLAST away continusously attempting retries of deliveries. and sometimes it is multiple times a second. What is the point of greylisting when it creates an exponential increase in the amount of processing overhead with the spammers ?
2) Is there a way to see an SMTP report of emails that were greylisted and only ever attempted once ? I cant find it built into SmarterMail. If the point of greylisting is for legitimate emails to retry and make it through, and discouraging spammers, there should be a way of proving that it is working. As far as i can see there is no way to evaluate if you are in fact just creating additional processing traffic
www.HawaiianHope.org - Providing technology services to non profit organizations, homeless shelters, clean and sober houses and prisoner reentry programs. in 2018, in just one year, we gave away 1,000 Free Computers !