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Error: smtplib Username and Password Not Accepted

What's Causing This Error?

This error occurs when the SMTP server cannot authenticate successfully using the credentials provided.

Additionally, you may encounter this error when connecting with the Google SMTP server using an account that does not support "Less Secure Sign In Technology."

This error also occurs due to firewall and virus guard issues in rare cases.

Solution - Here's How To Resolve It

Ensure that the credentials provided are correct. If you are connecting to a Google SMTP server, ensure that you've enabled "Less Secure Sign In Technology" and have disabled Two-Factor Authentication.

Less Secure App Access

Other Common SMTPLIB Errors (and Solutions)

View all errors

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