Sign in Try for free

SMTP Message not delivered. Manual intervention required.

Syntax error

Syntax error in parameters

● Command not implemented

Bad sequence

Authentication required

Transaction failed

Struggling with errors?

● Postigo automatically handles SMTP errors, rotates accounts, and ensures maximum deliverability.

SMTP Guides

Other SMTP guides

Need mass mailings?

Postigo automatically rotates SMTP, randomizes content via AI, and collects feedback.

Authentication failed

SMTP Configuration Guides

Complete guides on setting up SMTP for Gmail, Outlook, Yahoo, Amazon SES, SendGrid, Mailgun, and other providers.

Invalid recipient

SMTP Configuration

Complete step-by-step guides on setting up SMTP for popular mail providers. Servers, ports, App Passwords, code examples in Python/PHP/Node.js.