Gmail & Yahoo sender requirements (2026 checklist)
If you send more than 5,000 messages a day to Gmail, you must authenticate with SPF, DKIM and DMARC, offer one-click unsubscribe and honour it within two days, and keep spam complaints under 0.3%. Yahoo and Microsoft follow the same playbook. Fail these and your mail is rejected, not just filtered.
In October 2023 Google announced new rules for bulk senders, and they took effect from February 2024. Yahoo announced the same. This page is the tick-list. For the wider picture, read the complete guide to email deliverability.
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Who counts as a bulk sender?
More than 5,000 messages to Gmail addresses in a day.
Google defines a bulk sender as anyone sending more than 5,000 messages to Gmail addresses in one day (Google, 2023). Cross that once and you're expected to meet the rules. Honestly, every sender should meet them anyway — Google itself calls them “basic email hygiene.”
The three requirements
Authenticate, let people leave, don't annoy people.
The first one is the big one, and it is the one people fail. Our step-by-step SPF, DKIM & DMARC setup guide walks through exactly what to paste.
The checklist
Work down this list before your next send.
2026 sender-requirements checklist
Common questions
What happens if I don't comply?
Your mail gets rejected rather than delivered. Google began enforcing from February 2024, and unauthenticated bulk mail is bounced.
I send fewer than 5,000 a day — do these apply to me?
The bulk-sender rules technically kick in above 5,000 a day to Gmail, but Google describes these practices as basic hygiene. Do them anyway; they're the difference between the inbox and the spam folder.
What is one-click unsubscribe?
A standard header that puts a real unsubscribe link at the top of the message, so a reader can leave in one click. You must process those requests within two days.
How do I check my spam-complaint rate?
Google Postmaster Tools shows it for Gmail. Keep it under 0.3%, and ideally under 0.1%.
Does Microsoft have the same rules?
Microsoft has moved in the same direction, requiring authentication for high-volume senders. Meeting the Google and Yahoo requirements puts you in good shape across the board.
Related guides
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