On 20/04/2021 11:00, Hans-Martin Mosner wrote: >> Normally I would expect the retries to pass greylisting. Does anyone have >> any insight into why this is not behaving as expected? The destination is >> exeter.ac.uk. >> >> Neil Youngman > The exeter.ac.uk postmaster is probably the only one who can tell you what > really happens, but as with all spam-reducing > heuristics it is quite possible that this system is somehow broken.
I tried the exeter.ac.uk postmaster, but got no response. I agree that it is probably simply broken. Sometimes it's helpful to be able to identify the failure mode, particularly if it is in a system that is used elsewhere. > Another possibility, which would for example apply to the mail systems for > which I'm responsible, is that temp rejection > is used to defer mail from questionable sources until a manual check shows > that they're likely genuine (or in some > cases, until a rbl hit indicates that others received the mail and > categorized it as spam). In this case, we wouldnt > talk about greylisting in the error message, though, as that is misleading. If something is causing our mail to be flagged as questionable that would also be worth knowing. This one of those questions where I don't expect to get a definite answer, but I might still learn something valuable from the discussion. Neil Youngman _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
