“Why is this message in Spam? It contains content that’s typically used in spam messages.”

This might be due to one or more of the following issues:

Why Gmail flags your content as spam – An infographic.

• Deceptive or hype-heavy subject and content. Promotional words such as “buy”, “order”, “discount”, “clearance”, “dear friend”, “as seen on”, “please help”, “free”, “offer”, “desperate”, and “additional income” can raise suspicion — but Gmail doesn’t keep a banned-word list, and one such word won’t flag you on its own. The risk climbs when you stack several of them, pair them with hype formatting, or your engagement is low. Subject-line wording carries more weight than body copy, so keep subjects especially clean and honest.
  
  
• Mismatched subject and content. Gmail now cross-checks your subject against the actual message. A subject that doesn’t convey what’s inside — or fake “RE:/FWD:” and clickbait — misleads contacts, earns spam reports, and directly triggers filters. Ensure your subject and content are relevant to each other.
  
  
• Relevance over “bad words.” The older idea that ordinary words become “spam triggers” at certain times (for example, disaster-related words during a hurricane) isn’t really how filters work now. What actually decides placement is whether recipients engage with your mail and whether it matches what they signed up for — so focus on relevance and timing that serves the reader, not on avoiding individual words.
  
  
• Requests for sensitive information. Seeking sensitive details in the email itself or on a landing page it links to creates suspicion and looks like phishing. If you must collect such information, add an optional step to ask for it when contacts sign up instead.
  
  
• Overly long or shouty subjects. Keep subject lines concise and scannable on mobile (a few words, roughly under 40–50 characters). There’s no magic length, but avoid ALL CAPS, excessive punctuation (!!!), and irrelevant symbols — combined with weak engagement, these push mail toward spam.
  
  
• Typos and sloppy copy. Spelling and grammar mistakes reduce trust with both contacts and filters. Proofread your subject and content before you hit send.
  
  
• Risky links. Ensure the URLs in your content aren’t blacklisted or low-reputation, and avoid unfamiliar secondary domains and multiple redirecting links — Gmail weighs the reputation of every domain you link to, not just your sending domain.

Suggestions from our deliverability team

Fix the foundation first: authentication and reputation

Then optimize the message

• Request your contacts to add your sender address to their contacts, so your emails have a higher chance of landing in the inbox, especially in the Primary tab.
  
• Highlight the unsubscribe link clearly — and include a one-click unsubscribe, now required for bulk senders. When people can’t unsubscribe easily, they report spam instead, which hurts you far more.
  
• Keep your design clean and uncluttered. Rather than worrying about specific background colors, avoid heavy, garish layouts and make sure the email reads clearly in both light and dark mode.
  
• Include images, but always pair them with real text (in case images don’t load) and add descriptive alt text. Avoid image-only emails — a healthy text-to-image balance improves both accessibility and deliverability.
  
• Write naturally and honestly. Copy that sounds human and relevant earns opens and clicks, and that engagement is what keeps your future emails in the inbox.