Re: 1. Re: Ordinary user account can't log in; 2. Greylisting

[Martin Husemann <martin%duskware.de@localhost>]

On Fri, Oct 11, 2024 at 04:13:48PM -0500, Jay F. Shachter wrote:
> The second person said "Greylisting is harmless and only causes a very
> small delay in mail delivery.  It needs no manual intervention".  I do
> not know what is the source of this person's information, but it is
> clearly a source into which he has deposited much too much confidence,
> because his statement is untrue.  Greylisting does require manual
> intervention.  I first have to notice that the recipient's MTA
> returned a 400-level error code, and then I have to manually re-send
> the mail.

This is not true. All reasonable MTAs will repeat the transmission
attempt after a transient error code like 450, in typical
configurations after 5 to 15 minutes.

If you have to manually resent it, your mail setup is broken.

Martin