alt Hacker NewsGmail only requires DMARC for senders that send >5000 emails per day. Below that it's not required. That rule only appeared in 2024 so I wouldn't say it's been required for a very long time. Perhaps you're thinking of DKIM, which is different.
Gmail only requires DMARC for senders that send >5000 emails per day. Below that it's not required. That rule only appeared in 2024 so I wouldn't say it's been required for a very long time. Perhaps you're thinking of DKIM, which is different.
Google required me to add a DMARC record for a domain that doesn't even send 5000 emails per year. I suspect it was because of another mail server that shared the same subnet but was not under my direct control.