On 26/10/2017 18:48, James Michael Keller via mailop wrote:
On 10/24/2017 05:06 AM, Mark Foster wrote:Hi All, I run a personal MTA but I host a few not-for-profits and such. Recently one of my users reported substantial delays on inbound emails, so I had a quick look... it turns out email from outlook.com was being seriously hindered by Greylisting. The retry rate on a 4xx error seems to be very slow (almost precisely an hour between retry attempts) and of course, the source IP address changes with each retry, so the Greylisting timers are always reset to zero... clearly I don't do enough mail volume to keep the timers up to a point where I know i'm getting 'clean' email. The only way I can see to reliably resolve this is to try to whitelist the sending IP's (is this even practical?) It'd be nice of messages from outlook.com were retried from the same source IP... this behavior seems to make greylisting on relatively low-volume mail servers something of a hassle, and across many years of running the MTA configured essentially this way, this is the first time i've had this sort of behavior reported. Cheers, Mark.
You can whitelist based on spf records, that's what I was doing when using greylisting.
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