How do I fix a 503 error when sending an email using the API?

Priyanka Gupta
Priyanka Gupta
  • Updated


Using the Send a Message endpoint to send an email may result in a '503' error. See the example below.

503: Unknown connection error - provider's SMTP server isn't reachable


This error occurs when Nylas isn't able to reach the provider's SMTP server to send the email. If the issue persists, please contact your e-mail administrator.

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