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What is a "mail service" and do I have to pay for one?

Updated Email Delivery 1.7.0Tested with WordPress 7.1

A company whose business is being trusted by the servers that receive email: Gmail, Microsoft 365, SendGrid, Mailgun, Postmark, Brevo and so on. Your site hands the message to them, they sign it and deliver it, and they tell you if it is refused.

For the amount a normal WordPress site sends, most of them are free. If you already have Google Workspace or Microsoft 365 for your own email, you can use that and add nothing.

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.