--- title: "The inbox has a landlord. Here are the house rules for your email." description: "Google writes Gmail's sender rules, ranks the Promotions tab, sells the ad slot in Gmail and summarizes mail before it is opened. Part 3 of Who Keeps Score: what each of those means for a studio, spa or gym that sends email." section: Playbooks author: David Steel published: 2026-10-24T12:15:38.235Z url: https://www.sneeze.it/blog/the-inbox-has-a-landlord tags: ["who-keeps-score", "email-marketing", "gmail", "deliverability"] --- # The inbox has a landlord. Here are the house rules for your email. _Google writes Gmail's sender rules, ranks the Promotions tab, sells the ad slot in Gmail and summarizes mail before it is opened. Part 3 of Who Keeps Score: what each of those means for a studio, spa or gym that sends email._ Say you run a gym with six locations, and on Monday you send a spring offer to your whole list. You wrote it. You paid for the email platform. The list is yours. From the moment you hit send, though, most of what happens next is decided by somebody else: whether the mail is accepted, which tab it lands in, where in that tab it sits, what paid message sits above it, and whether your member reads your words or a summary of them. For everyone on your list with a Gmail address, that somebody is Google. Google says 3 billion users rely on Gmail. We use it ourselves, and so do most of our clients. Google publishes most of its rules, so this part is mostly a reading of them. When you send email to Gmail, you are a tenant, and it helps to read the lease. In [Part 2](/blog/google-changed-its-gmail-ads-promise) we read Google's new wording on Gmail and ads. Here is everything else the landlord sets. ## Google writes the sender rules On October 3, 2023, Neil Kumaran of Gmail's security team announced new requirements for bulk senders, "those who send more than 5,000 messages to Gmail addresses in one day." By February 2024, they had to authenticate their email, let people unsubscribe in one click and process that request within two days, and stay under a spam-rate threshold. Google's current Email sender guidelines spell out the details. Every sender, of any size, must set up SPF or DKIM authentication and keep spam rates reported in Google's Postmaster Tools below 0.3%. Bulk senders must also align their From domain for DMARC and support one-click unsubscribe on marketing mail. Google recommends staying below 0.10%. Mail from senders that miss the rules, the page says, "might be marked as spam." :::stats 5,000 | messages a day to Gmail that make you a bulk sender 2 days | to process an unsubscribe request 0.3% | spam-rate ceiling for every sender 0.10% | the spam rate Google recommends staying under source: [Google, Oct. 3, 2023](https://blog.google/products/gmail/gmail-security-authentication-spam-protection/); [Gmail Help, Email sender guidelines](https://support.google.com/a/answer/81126?hl=en) ::: These rules are reasonable, and they cut spam. They are also one company's rules, enforced by that company, for the inbox most of your customers use. A multi-location brand with a large list can cross the bulk line on a single campaign day. ## Google ranks the Promotions tab, and sells a slot in Gmail Once mail is accepted, Gmail sorts it. Most marketing email lands in the Promotions tab, and inside that tab, Google's developer page says, "Gmail automatically groups and highlights emails in the Promotions tab that people are most likely to engage with." Senders can add annotations such as deal details and images. Google says those "are not ads and happen automatically based on a number of factors." It does not publish the factors, and it does not promise any annotation will show. Gmail is also ad inventory. Google Ads Help describes Demand Gen campaigns as ads that run "across YouTube (including Shorts), Discover, Gmail, Maps, and the Google Display Network." So the company that ranks your promotion in Gmail also sells ad space inside Gmail to other advertisers, including a competitor down the street. And Gmail helps readers leave. Since July 2025, rolling out in select countries, a Manage subscriptions view lists senders "sorted by the most frequent senders" with a one-click unsubscribe. In January 2026, Google said Gmail "synthesizes the entire conversation into a concise summary of key points," a feature "rolling out today for everyone at no cost." :::flow "What happens to your email between send and read" The gate | Sender rules decide whether Gmail accepts it The tab | Gmail files it, usually in Promotions The ranking | Gmail decides what to group and highlight The slot above | An ad can sit at the top of that tab The summary | The reader may see a summary before your words ::: ## What is documented, and what is not Everything above comes from Google's own pages. What is not documented is any claim that Gmail holds down a particular brand's mail on purpose. We do not claim it. Inbox placement is automated and mostly unexplained, which is a reason to measure your own results rather than guess at motives. Google itself says not to lean on the number most senders watch: :::pullquote "Google doesn't track open rates. Google can't verify the accuracy of open rates reported by third parties." -- Google, Gmail Help, Email sender guidelines ::: :::compare "What the landlord controls" "What the tenant controls" Whether mail is accepted. Which tab it lands in. How the Promotions tab ranks it. Who buys the ad slot above it. Whether a summary reaches the reader first. --- Whether the domain is authenticated. Whether unsubscribing is easy. What the first line says. How often you send. Which result you count as success. ::: :::figure wide ![A building lobby with a wall of small mailboxes, where a small glowing magenta figure on tiptoe slots a single envelope into a box while a building manager's ring of keys hangs on a hook nearby](/blog/media/27fdda6e1eda6a02fd57b6ee.jpg) You rent the space. You still decide what goes in the envelope. ::: ## What a local business can do Paying more for email does not move the landlord. The fixes are cheaper and more boring than that, and they work for a two-location studio as well as a 40-location franchise. :::steps 1. Authenticate your sending domain Ask your email platform to set up SPF, DKIM and DMARC for the domain you send from, and check them in Google's Postmaster Tools. This is the entry ticket, and it is free. 2. Keep one-click unsubscribe on every marketing email Make leaving easy. A member who cannot find the exit marks you as spam, and your spam rate is the number Gmail enforces. 3. Put the offer in the first line Price, what is included, the end date and the location, in plain text near the top. If a summary or a preview is all your member sees, it should still carry the offer. 4. Judge email by bookings and replies Count classes booked, consultations scheduled and replies from the link in each email. Google says it doesn't track open rates and can't verify the ones third parties report. ::: We wrote about the summary side, and what survives it, in [Your email gets read by an agent first](/blog/your-email-gets-read-by-an-agent-first). For counting results when the inbox and the agents in it keep changing, see [Measuring marketing when agents shop](/blog/measuring-marketing-when-agents-shop). :::takeaways "What to take from this" - Google sets Gmail's sender rules: authentication for everyone, one-click unsubscribe and a two-day deadline for bulk senders, and a 0.3% spam-rate ceiling. - Gmail ranks the Promotions tab by likely engagement, and Google sells ad placements in Gmail. - We found no court or regulator ruling that Gmail holds down a specific brand's mail on purpose. Don't assume it. Measure. - Authenticate, make leaving easy, lead with the offer and count bookings, not opens. ::: Next, in [Part 4](/blog/amazon-locks-out-ai-agents-but-not-googlebot), we leave the inbox for the website and read what Amazon's robots.txt lets in and keeps out. :::cta Not sure your email is set up the way Gmail expects? We will walk through your sending setup and your first lines with you, and show what to fix first. ::: --- #### Sources - Google, Neil Kumaran, "New Gmail protections for a safer, less spammy inbox," October 3, 2023. [blog.google](https://blog.google/products/gmail/gmail-security-authentication-spam-protection/) - Google, Gmail Help, "Email sender guidelines," read October 24, 2026. [support.google.com](https://support.google.com/a/answer/81126?hl=en) - Google for Developers, "Gmail Promotions tab annotations." [developers.google.com](https://developers.google.com/workspace/gmail/promotab) - Google Ads Help, "About Demand Gen campaigns." [support.google.com](https://support.google.com/google-ads/answer/13695777) - Google, Chris Doan, "Declutter your inbox with Gmail's newest feature," July 8, 2025. [blog.google](https://blog.google/products/gmail/new-manage-subscriptions-unsubscribe/) - Google, Blake Barnes, "Gmail is entering the Gemini era," January 8, 2026. [blog.google](https://blog.google/products-and-platforms/products/gmail/gmail-is-entering-the-gemini-era/)