SMTP enhanced status code 5.7.14

What the registry says

The basic codes it travels with

• 535 Authentication credentials invalid
• 554 Transaction failed (Or, in the case of a connection-opening response, "No SMTP service here")

In practice

Under RFC 5248, X.7.14 means a submission server needs a trust relationship to fetch message content. Gmail uses 534 5.7.14 to ask the user to sign in through a web browser, which usually follows a sign-in Google judged risky. Signing in on the web and clearing the prompt usually restores access.

What the sender should do

Set up the trust relationship, or for Gmail, sign in through the browser and complete any security check, then retry from the client.

How providers use X.7.14

Quoted from each provider’s own error reference.

• Gmail 534 5.7.14

  Please log in through your web browser and then try again. For more information, go to Can't sign in to your Google Account.

Common questions

What does 5.7.14 mean?

X.7.14 means the submission server needs a configured trust relationship with a third-party server to fetch the message content. Gmail uses 534 5.7.14 to ask the user to sign in through a web browser first.

What should I do about 5.7.14?

Set up the trust relationship, or for Gmail, sign in through the browser and complete any security check, then retry from the client.

Would an email verifier have caught 5.7.14?

No. This reply is about your sending setup, the message or the receiving system, not about whether the address exists, so verifying the list will not prevent it.