It appears that Viktor Dukhovni via mailop <mailop@mailop.org> said: >On Thu, Dec 05, 2024 at 06:20:11AM -0800, Michael Peddemors via mailop wrote: > >> And for the record, ESP's and senders should NEVER assume that they can send >> even 100 recipients. > >Well, senders really SHOULD be able to, the fact that some large >providers feel at liberty to violate the specification, and the communit >lets them get away with it is regrettable... Postfix defaults to at >most 50 recipients per SMTP envelope of a multi-recipient message.
It's worth keeping in mind that this discussion is almost entirely hypothetical. People at large mail systems tell me that the vast majority of messages they get have a single recipient, and the average number of recipients is about 1.1. Any mailer sending a lot of mail puts a unique opt-out link in each message so one click unsubscribe works, and the upcoming DKIM2 will only work with single recipient messages to deal with spam blowback and replay attacks. Before someone complains about how wasteful it is to send multiple copies, give me a break. Mail messages are tiny. When you stream a movie, that's as much data as your mail server uses all day. R's, John PS: This is not a new argument. I've been using qmail since about 1999 and it has never sent more than one recipient per delivery. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
