From November 2025 Google began enforcing its sender rules properly: messages that fail authentication are now temporarily or permanently rejected, where before they were mostly delayed or junked. If Gmail users stopped receiving your emails, your domain probably isn't passing SPF, DKIM and DMARC for every service you send from.
What Gmail now expects
- SPF or DKIM passing for every message, and both for anyone sending in bulk
- A DMARC record on your domain
- The From address aligned with the domain that passes
- A one-click unsubscribe on marketing email
- A low spam-complaint rate
Signs it's affecting you
Bounces mentioning "unauthenticated" or "5.7.26", customers on Gmail saying they never got a quote, or newsletters with suddenly falling open rates.
What to do
Work out every system that sends as your domain (email, website, CRM, invoicing, bookings), then set up SPF, DKIM and DMARC so they all pass and align. Test by sending to a Gmail address and opening "Show original": you want PASS against SPF, DKIM and DMARC.
Our same-day email fix covers this end to end, including the services people forget.
