On Wed, Aug 5, 2026 at 9:15 AM Anthony Cartmell via mailop < [email protected]> wrote:
> > This page suggests that it's a requirement for "high volume senders" to > use > DKIM as well as SPF and DMARC: > > Sadly is doesn't say over what time period "5,000 messages" is measured > over, for a sender to be classed as "high volume". Nor does it say when > this requirement for DKIM came into effect. > Considering that nearly all (larger) mailbox providers have required senders to authenticate with DKIM (often aligned) for several years now, I wouldn't worry too much about the (not so new) Outlook requirements, but instead invest in sending DKIM-signed emails. And while you do that, also read up on DKIM2. -- Marcel
_______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
