On 5/7/22 1:55 AM, Ted Mittelstaedt wrote:
I used to greylist and it helped a lot.
I used to use grey listing too. I've found no listing to be equally effective.
2FA killed that, however. When someone logs into a website, bank, etc quite often they use an email address as the second factor - so for that to work the email has to be delivered instantaneously. Also most 2FA does not follow any kind of SMTP standard, the will attempt delivery once and not retry if it fails.
No listing tends to benefit from this in that the sender is able to use the next server in line as soon as the sender can establish the connection fractions of a second later.
Once 2FA became a big deal for the banks I got far too many user complaints on the greylisting to keep it.
I've not knowingly had any problems with no listing like I used to have with grey listing.
-- Grant. . . . unix || die
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