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Gmail warns people to be careful with your email

Your customer opens your email and sees a yellow or red box: "Be careful with this message." Would you click a link under that? Neither would they.

Updated · senderframework.com

Signs this is happening to you

  • Customers mention a warning box on your emails.
  • People won't click your links or open your files.
  • Gmail says it "can't verify" that your email came from you.
  • Some customers ask if you have been hacked.

Why does Gmail say be careful with this message?

Gmail shows this warning when it can't prove an email came from the business it says it's from. To Gmail, an email that can't prove itself looks like the start of a scam.

It isn't a judgement on what you wrote. It's about proof that the email is really yours.

What does it cost me?

Trust. A warning box on your email tells a customer to doubt you. They may not pay the invoice, click the link, or answer at all.

Why does it only happen sometimes?

Because only some of the ways you send email can prove it's you. Your own mailbox may be fine, while your booking tool or your website is not.

What we find that others miss

These are small things. Each one is enough to send your email to spam, or let a fake through.

Is any of this hiding in your email? Find out today.

Why senderframework.com

Your customers should see your email, not a warning about it.

We find the part of your email that can't prove it's you, and hand you the exact change that fixes it.

senderframework.com was built by people who have spent years in the email business, fixing problems just like this one for businesses just like yours. We have seen every way business email goes wrong. Email is all we do, and we do it every single day.

  • Once you're set up, the big email companies report to us each day on the email sent in your name. We read every line, so you don't have to.
  • Plain words, not codes. What's wrong, how much it matters, and what to do about it.
  • The exact change to make, built from what you already have. Hand it to whoever runs your email and it's done.
  • When something breaks, you hear it from us first, not from a customer.

Not ready yet? See where your email stands in seconds, free:

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Build 91 · d8c4753 · 2 Nov 2026, 13:17 UTC