How to Fix SMTP Error 535: Username and Password Not Accepted for Gmail in Go?

SMTP Error 535: Resolving "Username and Password Not Accepted" for Gmail in Go

In the provided code, you're encountering an error when sending emails with SMTP in Go. The error message, "535 5.7.8 Username and Password not accepted," indicates that Gmail is rejecting your credentials.

To resolve this issue, consider the following steps:

1. Enable Two-Factor Authentication:

Ensure that you have enabled two-factor authentication (2FA) for your Gmail account at myaccount.google.com/security. 2FA adds an extra layer of security by requiring a code sent to your phone upon login.

2. Generate an App Password:

Instead of using your regular password, create an app password at security.google.com/settings/security/apppasswords. App passwords allow you to grant specific access to third-party applications without exposing your main password.

3. Use the App Password:

In your Go code, update the "pass" variable to use the app password you generated in step 2.

4. Modify the Authentication Mechanism:

Currently, you're using the PlainAuth function to authenticate. Instead, try using OAuth2 authentication for improved security and reliability. You can find more information on using OAuth2 with Gmail here: https://developers.google.com/identity/protocols/OAuth2

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