Is "congratulations" a spam trigger word?
"Congratulations" is the signature opening of prize, lottery, and "you've won" scams, so spam filters and recipients treat it as a mild negative content signal — most when it congratulates a stranger for nothing real and pairs with "you've been selected" and a claim link. It's a weighted signal, not an automatic block: deliverability is driven by authentication and reputation, and one genuine "congratulations" from a well-authenticated sender rarely lands in spam on its own.
Also flagged: congratulations you've won, congrats, you've been selected, you're a winner.
"Congratulations" isn't banned, and congratulating a real person on a real event — a funding round, a promotion, a launch — is perfectly normal email. The problem is that the word is also the signature opening of prize and phishing scams ("Congratulations, you've won!"), so when it greets someone you don't know, for no reason they recognize, it reads as bait to both the filter and the human. That nudges your content-risk score up, and that score only bites when it compounds with caps, exclamation marks, a claim link, and a cold sending reputation.
- Category
- Shady / phishing
- Risk level
- Medium (higher when unearned or in subject)
- Worst variants
- Congratulations you've won, you've been selected, you're a winner
- Safer phrasing
- Name the real event: "Saw you launched X — nice work"
Key takeaways
- "Congratulations" is a weighted content signal, not an automatic block — deliverability is mostly authentication (SPF/DKIM/DMARC), sender reputation, and engagement, with wording acting as a tiebreaker.
- The risk spikes when it congratulates a stranger for nothing real, sits in the subject line, or stacks with "you've won", "you've been selected", and a claim link.
- Phishing and prize scams built the word's bad reputation — Microsoft's phishing guidance uses "Congratulations! You've Been Selected" as a textbook lure, and the FTC catalogs "you've won" prize scams.
- A specific, sincere congratulations on a real, verifiable event (a launch, a round, a milestone) is low-risk; a vague, unearned one is not.
- If you're nervous, lead with the specific reason — "Saw you closed the Series B —" reads as a person; "Congratulations! You've been selected" reads as a scam.
Why does "congratulations" trigger spam filters?
Modern filters (Gmail, Outlook, Apple Mail) don't keep a banned-word list — they score messages with models trained on enormous volumes of wanted and unwanted mail. "Congratulations" is the canonical opening of prize, lottery, and "you've won" scams, so it appears far more often in the unwanted pile than in normal 1:1 conversation, which nudges a message toward the spam or promotions folder.
The tell isn't the word itself — it's congratulating someone for nothing they recognize. Real congratulations name a real event; scams congratulate a stranger to manufacture excitement before asking them to "claim" something. Microsoft's phishing guidance even uses "Congratulations! You've Been Selected for a $500 Gift Card" as its textbook prize-scam example, and the FTC catalogs "you've won" sweepstakes and lottery fraud.
So the word is a weak signal on its own and a strong one in the wrong company: "congratulations" plus "you've been selected", an all-caps subject, a claim link, and a sender with no history is exactly the cluster filters are tuned to catch.
Does "congratulations" always send an email to spam?
No — and nothing about a single word does. Authentication and reputation do most of the work. If your domain passes SPF, DKIM, and DMARC, you keep spam complaints low (Gmail wants you under 0.10% and never at 0.30%), and recipients open and reply, a genuine "congratulations" reaches the inbox. Google's sender guidelines judge senders mainly on authentication, low spam-complaint rates, and easy unsubscribe — not on a forbidden vocabulary.
Treat the word as a tiebreaker. On a warmed-up domain, congratulating a real person on a real event is fine. On a cold domain, in a mass blast, or in a subject line where every word carries extra weight, an unearned "congratulations" is precisely the kind of easy risk you should trade away.
The deciding factor is sincerity and specificity. "Congrats on the launch" tied to a launch that actually happened reads as human; "Congratulations, you've been chosen" tied to nothing reads as a scam — and the filter has seen the scam version far more often.
What can you use instead of "congratulations"?
If you're congratulating someone for a real reason, lead with the reason, not the word. "Saw you closed the Series B", "Noticed you just shipped v2", or "Congrats on the VP Sales role" all anchor to something true and verifiable — which is what makes them read as a person rather than a prize draw.
If there's no real event, don't manufacture one. A fake or generic congratulations is the exact pattern filters and recipients distrust most, and it erodes trust the moment it's noticed. Open with relevance instead — a specific observation about their company or role.
And keep the surroundings calm: no all-caps subject, no "you've been selected" hook, no exclamation pile-up, and no "claim now" link. The wording is the easy part — the scammy packaging around it is what actually costs you the inbox.
Before and after
As of June 2026.Sources:Google — Email sender guidelinesMicrosoft Security — What is a phishing email?FTC Consumer Advice — Fake Prize, Sweepstakes, and Lottery Scams
Is “Congratulations” in your email?
Paste your draft into the free Email Spam Checker. It highlights every trigger word, scores your inbox placement 0–100, and rewrites the email to pass — in seconds, no signup.
Check your email freeRelated spam words
“Congratulations” — frequently asked questions
