Errors That Might Appear When Testing Your SMTP Connection
When building forms that send or receive emails, the first step is to properly configure SMTP (Simple Mail Transfer Protocol). Without a correct SMTP setup, your form’s email functionality will fail.
Step 1 – Configure SMTP
Before anything else, set up your SMTP settings with the correct host, port, encryption method, username, and password.
You can follow a detailed guide on how to configure SMTP here: link
Step 2 – Send a Test Email
Once configured, send a test email.
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If the test is successful, your SMTP is working correctly.
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If the test fails, you might see one of the following error codes:
Common SMTP Errors and What They Mean
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AUTH_FAILED
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Meaning: Your SMTP username or password is incorrect.
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Fix: Double-check the email address and password
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CONNECTION_FAILED
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Meaning: The SMTP host or port settings are incorrect.
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Fix: Verify the SMTP host (e.g.,
smtp.gmail.com) and the correct port (e.g., 465 for SSL, 587 for TLS).
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SMTP_REJECTED
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Meaning: The SMTP server rejected the email. Possible reasons include:
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Recipient address is invalid or blocked.
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The server’s spam filter flagged the message.
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Fix: Verify the recipient’s email address, check your sending domain reputation.
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TIMEOUT
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Meaning: The SMTP server took too long to respond, possibly due to being overloaded or slow.
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Fix: Try again later or use a different SMTP server.
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SSL_ERROR
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Meaning: Your account attempted to connect to the SMTP server over SSL/TLS encryption, but the secure handshake failed.
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Fix: Ensure you are using the correct encryption type (SSL/TLS) and that your server supports it.
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SMTP_GENERAL_ERROR
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Meaning: An unknown error occurred between your account and the SMTP server.
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Fix: Contact your email service provider if the issue persists.
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By understanding these error messages, you can quickly troubleshoot and fix SMTP issues, ensuring your forms send and receive emails reliably.