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Answer

My username and password are right and it still says they are wrong

Updated Email Delivery 1.7.0Tested with WordPress 7.1

They are probably not the ones the service wants. For most of them, neither is what you sign in with:

  • Gmail wants an App Password, not your Google password.
  • SendGrid wants the literal word apikey as the username.
  • Postmark wants the Server API token as both.
  • Mailgun, Brevo and SMTP2GO each have a separate SMTP login and SMTP password on their own SMTP page.
  • Amazon SES wants SMTP credentials made in the SES console — an AWS access key is a different thing and will be refused.

The hint under the password box says which one your chosen service wants.

Still stuck? Ask the developers who wrote it. We aim to reply within one business day.

Email Delivery

Send your site's email through a real mail service, and see what happened to every message.

From $19 a year · every feature · 30-day refund

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The Send a test screen of Email Delivery in WordPress admin. A red box reads It did not go. SMTP Error: Could not authenticate. Below, a panel headed What the mail server said, noting it is safe to paste into a support request, shows the full conversation with smtp.sendgrid.net, the sign-in lines replaced by [credentials hidden], ending in 535 Authentication failed: The provided authorization grant is invalid, expired, or revoked.