Grant Taylor via Mailman-Users <mailman-users@python.org> writes: > On 12/13/19 9:02 PM, Mark Sapiro wrote: >> As postgrey learns, it will remember triplets (sender, sending IP, >> recipient) and not delay them and in addition will whitelist domains >> that retry successfully more than a few times. > > The bigger senders are doing things now (more than ever) that they > weren't doing 15+ years ago. Now farms of servers will try to contact > you. The message may first try from one IP, then from another IP, then > from a 3rd.... It may eventually try from the same IP and make it through. > > I think most grey list solutions have an option to specify the network > (frequently configured a a /24) for the sending IP. This significantly > helps with different servers in the same server farm trying to resend > messages.
Some greylisting solutions also allow you to whitelist a domain or subdomain, but this can result in spammers spoofing that domain getting through... Keith -- ---- from my mac to yours... Keith Seyffarth mailto:w...@weif.net https://www.weif.net/ - Home of the First Tank Guide! https://www.rpgcalendar.net/ - the Montana Role-Playing Calendar ---- http://www.miscon.org/ - Montana's Longest Running Science Fiction Convention ------------------------------------------------------ Mailman-Users mailing list Mailman-Users@python.org https://mail.python.org/mailman/listinfo/mailman-users Mailman FAQ: http://wiki.list.org/x/AgA3 Security Policy: http://wiki.list.org/x/QIA9 Searchable Archives: http://www.mail-archive.com/mailman-users%40python.org/ Unsubscribe: https://mail.python.org/mailman/options/mailman-users/archive%40jab.org
