Google and Yahoo Sender Requirements: What Applies to Transactional Email

The short answer

Transactional senders are not exempt from the authentication, DNS, TLS and spam-rate rules. They are exempt from one thing: both Google and Yahoo say one-click unsubscribe is required only for marketing and promotional messages, not for transactional messages such as password resets and order confirmations. If you cross Google's bulk-sender volume, or Yahoo considers you a bulk sender, you also need DMARC and both SPF and DKIM.

What each provider requires, side by side

As checked on October 30, 2026, from Google's email sender guidelines, Google's sender guidelines FAQ, Yahoo's sender requirements and Yahoo's sender FAQ:

Who counts as a bulk sender

Google defines a bulk sender as any sender that sends close to 5,000 messages or more to personal Gmail accounts within a 24-hour period, counting every message from the same primary domain. Senders who meet that once are permanently classified as bulk senders. Yahoo says a bulk sender is one sending a significant volume of mail and does not publish a volume threshold.

So a product that only sends receipts and password resets can still become a bulk sender in Google's terms if enough of its users are on Gmail. The practical advice is the same either way: set up SPF, DKIM and DMARC on your sending domain before you need them. Google itself recommends always setting up all three.

What this means for a transactional sender

• Authenticate the sending domain with SPF and DKIM, and publish a DMARC record. p=none satisfies both providers' minimum for bulk senders. Our guide to moving from p=none to p=reject covers the next steps.
• Keep spam complaints low. Google's FAQ says to keep the user-reported rate below 0.1% and never reach 0.3%; Yahoo says below 0.3%.
• Do not mix content types. Google's guidelines say not to include promotions in receipt-style messages, and Yahoo recommends separating bulk marketing from transactional mail by IP or DKIM domain. Keep marketing mail off your transactional domain.
• You do not need one-click unsubscribe on password resets, receipts and similar messages. Yahoo adds that if you see high complaint rates on mail that is not legally required to carry an unsubscribe link, offering one may still help.
• Increase volume gradually. Both providers warn that sudden spikes from a new sender can be flagged.

Forward and reverse DNS and TLS are properties of the servers that connect to Gmail and Yahoo. If you send through an email API, those servers belong to the provider, so ask the provider how it meets them. Google's guidelines also say to verify that any email service provider authenticates your domain with SPF and DKIM.

How this relates to AISend

AISend sends through AWS SES and requires a verified domain of your own before you can send to anyone other than your own account email, so SPF and DKIM are set up as part of onboarding. AISend is newer and has no long shared-IP history, and nothing on this page is a promise about where your mail lands. DMARC is a record you publish yourself: use the free SPF and DMARC checker to see what your domain currently publishes.

AISend's 3-day trial is free: 500 emails, no card, one verified domain. Paid plans are charged when you subscribe. AISend is for transactional and consented mail, and sending to anyone other than your own account email requires a verified domain.

Frequently asked questions

Sources

• Google: Email sender guidelines
• Google: Email sender guidelines FAQ
• Yahoo Sender Hub: Sender requirements
• Yahoo Sender Hub: FAQs