I didn’t want to even post the link but… At one point in my life I had over a hundred thousand subs relying on this.
Omg I’m old. Sent from my iPhone > On Jul 25, 2023, at 10:55 PM, John Levine via mailop <mailop@mailop.org> > wrote: > > It appears that Mike Hillyer via mailop <m...@mikehillyer.com> said: >> So, before allowing access to submission service, Postfix consults IMAP >> server (Dovecot in this case) to check if there is actually a >> currently existing authenticated IMAP session from that IP address. Only if >> such a session exists, connection is allowed and the client >> may proceed to authentication attempt. Otherwise, the connection is >> immediately rejected. > > This is a very old idea. See https://en.wikipedia.org/wiki/POP_before_SMTP > > It's not clear who originally invented it. It may have been me. > > R's, > John > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
