On 4/24/20 9:40 AM, Ken Hohhof wrote:
That sounds like the greylisting fans who claim email senders are
required to retry again within 15 minutes from the same IP address.
Sure. And in the real world …
Greylsiting is highly effective against a specific set of spew sources:
compromised machines connecting directly to SMTP. But now most ISPs
block port 25 by default (since port 587 is now widely supported) so you
don't see a high volume of fire and forget compromised users anymore.
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