SMTP Error – Could not Authenticate

Replies: 0

Hi
When sending a Test message in the Test tab we get an error message:

CLIENT -> SERVER: EHLO underground-england.com
CLIENT -> SERVER: AUTH LOGIN
CLIENT -> SERVER: [credentials hidden]CLIENT -> SERVER: [credentials hidden]SMTP ERROR: Password command failed: 535 Authentication failed: The provided authorization grant is invalid, expired, or revoked
SMTP Error: Could not authenticate.CLIENT -> SERVER: QUIT
SMTP ERROR: QUIT command failed: SMTP Error: Could not authenticate.