On Wed, Feb 7, 2024 at 7:46 AM Royce Williams via mailop <mailop@mailop.org> wrote:
> This only applies if your sending more than 5000 messages per day. >> Most smaller senders are still fine using only "SPF *or* DKIM" and do not >> *need* a DMARC record: >> >> https://support.google.com/a/answer/81126 >> <https://urldefense.com/v3/__https://support.google.com/a/answer/81126__;!!Op6eflyXZCqGR5I!Ff5Zo4TRsvoBVBX1e-4SXFRgWBYIla7WfTVGLDcE-VW6cN_m_cTM49qQHZ6PsFYCshzD-uXVN7F95szNvwPj$> > > > Unfortunately, this is not correct, despite the official documentation. > There are multiple reports on Reddit and other places of people getting the > explicit "authentication required" SMTP response at much lower volumes. > I've also experienced it directly myself, on domains that I directly > control that don't do 50 a day, let alone 5000. > "authentication required" means just that: authenticate your traffic with DKIM or SPF. That is required for everybody. DMARC is only required for bulk senders. Both the statement you replied to and the official documentation is correct.
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