On Wed, Mar 26, 2025 at 5:14 AM Jeremy Harris <j...@wizmail.org> wrote: > > On 3/26/25 10:04 AM, Alessandro Vesely wrote: > > AFAIK, most or all mailing lists send single messages, otherwise they > > couldn't do VERP, but I'm not sure it's a universal rule. > > I am aware of some that send at least some of their output as > multiple-recipient messages. Given the prevalence of 800lb > gorillas being recipient sites, this is a major difference > in wire time as well as processing overhead. > > Are there any other mailing-list operators monitoring here?
If you're looking for operational experience, I was director of deliverability for a marketing cloud platform for 15 years that served up billions of messages annually. It utilized VERP. It was already doing one message per rcpt to, and had been for years. Many bulk sender platforms were built on top of LISTSERV or used it as inspiration, and it uses VERP, going back long before I ever even first used it in 2000. A few other bulk email sender platforms do NOT use VERP; using a static return-path for the whole batch mailing, recognizing that few legitimate (non-backscatter) bounces come back post send nowadays. Even for those platforms, they effectively still utilize "one message per rcpt to" as they use salted links and image paths to track clicks and opens, respectively. So if the question is, is this how it primarily is today, the answer is that there's lots of examples out there that suggest yes. Cheers, Al Iverson -- Al Iverson // 312-725-0130 // Chicago http://www.spamresource.com // Deliverability http://www.aliverson.com // All about me https://xnnd.com/calendar // Book my calendar _______________________________________________ Ietf-dkim mailing list -- ietf-dkim@ietf.org To unsubscribe send an email to ietf-dkim-le...@ietf.org
