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Google and Yahoo sender requirements: what small shops need to do

Since 2024, Gmail and Yahoo expect senders to authenticate their domain, offer one-click unsubscribe and keep spam complaints low. Microsoft followed for Outlook in 2025. If your emails have started landing in spam, this is the first place to look.

What the sender requirements are

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From February 2024, Google and Yahoo started enforcing rules for anyone sending marketing email to their users. The strictest rules apply to bulk senders (Google’s threshold is around 5,000 messages a day to Gmail addresses), but the basics apply to everyone and are simply good practice.

  • Authenticate your sending domain with SPF and DKIM
  • Publish a DMARC record (a policy of “none” is the minimum)
  • Send from your own domain, not a free Gmail or Yahoo address
  • Offer one-click unsubscribe and honour it within two days
  • Keep spam complaints below 0.3%, and ideally below 0.1%

SPF, DKIM and DMARC in plain English

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SPF

A list, published on your domain, of the services allowed to send email for you.

DKIM

A signature added to each email that proves it came from you and was not changed on the way.

DMARC

A record that tells inboxes what to do when an email claims to be from you but fails those checks, and sends you reports about it.

All three are DNS records. Your email platform gives you the values, and whoever manages your domain adds them. It is usually a half-hour job.

One-click unsubscribe

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Most platforms now add the technical header for one-click unsubscribe automatically, which shows as an unsubscribe link next to your sender name in Gmail. Check it is on, and do not hide the unsubscribe link in your footer. Making it hard to leave increases spam complaints, which is worse.

Want this checked on your own account? The free audit does it by hand, in five working days.

Get the free auditSee pricing

The spam complaint rate

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This is the rule that catches small shops out. It is the share of recipients who mark your email as spam. Gmail’s Postmaster Tools shows it for your domain. Above 0.3% your placement suffers; the safer target is under 0.1%.

The usual causes are emailing people who did not clearly sign up, emailing people who stopped engaging long ago, and sending too often. The list quality guide covers the fix.

Microsoft and Outlook

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In 2025 Microsoft introduced similar requirements for high-volume senders to Outlook.com, Hotmail and Live addresses: SPF, DKIM and DMARC in place. If you meet the Google and Yahoo rules, you are most of the way there.

What to check this week

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  1. Look up your domain’s SPF, DKIM and DMARC records, or ask your platform’s setup page whether authentication is complete
  2. Set up Google Postmaster Tools and check your spam rate
  3. Send a test to a Gmail address and look for the unsubscribe link by the sender name
  4. Suppress contacts with no opens or clicks in six months or more

The free audit checks all of this. The inbox changes guide covers the wider shifts in how inboxes sort email.

Questions people ask

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Do the Gmail rules apply to small senders?

The strictest rules apply above roughly 5,000 emails a day to Gmail, but authentication, easy unsubscribes and low complaints apply to everyone.

What spam rate is acceptable?

Below 0.3% is the hard limit. Below 0.1% is the safe target.

Do I need DMARC?

Yes. A DMARC record with a policy of none is the minimum, and it takes minutes to add.

Why are my emails going to spam?

Most often missing authentication, a high complaint rate or sending to people who stopped engaging. The free audit checks each one.

Read next

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