-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi,
Am Di den 24. Okt 2017 um 10:06 schrieb Mark Foster: > 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. Well, i mostly only get spam from outlook.com. So it might be no false positive to blacklist them completly. More over, they don't react on postmaster mails (if you ever get lucky to get them delivered). However, since years I do not do a simple greylist approach as that is not needed and to "stupid". I like and use the way, grossd is helping. Only if the host is on two low priority blacklist or on one high trusted blacklist, I do greylist them. All other mais don't get delayed. A note about dnswl. I "missuse" one of their categories to blacklist self tagged marketing provider. That is very efficient with simply no false positive. (127.0.15.0/24) On the other hand, not delaying all spf matches does not help as there are spammers out there with a proper spf record. Regards Klaus - -- Klaus Ethgen http://www.ethgen.ch/ pub 4096R/4E20AF1C 2011-05-16 Klaus Ethgen <kl...@ethgen.ch> Fingerprint: 85D4 CA42 952C 949B 1753 62B3 79D0 B06F 4E20 AF1C -----BEGIN PGP SIGNATURE----- Comment: Charset: ISO-8859-1 iQGzBAEBCgAdFiEEMWF28vh4/UMJJLQEpnwKsYAZ9qwFAlnyL7UACgkQpnwKsYAZ 9qzqsQwAkdq30BvbxEUuxBMTRliO7jUfPczAWmEa1VzpVVCaY4yTYSSFjZb7Ixic FeyHJRAotiCKTvQMd2d8eo7n+4Xy5eYpgcLhotb9cjBQrPou7wxI23bWWQya/hX+ YU1GzhotTRjD3Grp18MpydwYZ4DTOA4jQc1tAUm1v+R7BBFoijEY1RtWuX698A4M 0iUHquNT6QpkEDDc8IemejvzBMSz3aIEiaNlY0vji9/1YqjBJdJG9GVhFMqG8O+n CyKAH79nGFhATgwBcqtNdTqhVrfPqOyrrg/3w+8GWayi1FRkJAuiRuAcYR7EdHv6 AuRIAKk3yjBG0VbzgRjrcTt3ynrtR0g+njtgRnPTDGjJQKQeVimBx4Y2rjmJPn44 vhRk0eSvAQV0zWUBNplIzzyfGnTtapTv0Kb7nZdSV1Di3RHqRW7Z66IyP6a3+VqY D+dZ5EjoPpFI5HoOckS8SS2hCre8NvrFBhPfSzn7SkKQrOjEXQxPm8riccB38qcR oCU4XLLO =1bBo -----END PGP SIGNATURE----- _______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
