How to Fix SwiftMail\'s Code 535 Error: Resolving Username and Password Not Accepted Issues with Gmail?

Username and Password Not Accepted: Resolving SwiftMail's Code 535 Error with Gmail

When sending emails through Gmail using SwiftMail, an "Expected response code 250 but got code "535"" error can arise. This error message indicates that the username and password provided are not accepted by the server. Identifying the root cause and applying the appropriate fix is crucial to restore email functionality.

One common reason for this error is Google flagging the email sender as potential spam, leading to temporary restrictions. To resolve this issue, it is essential to confirm that the account access was legitimate and that the sender is not engaging in suspicious activities. After verifying the account and resolving any underlying spam concerns, attempt email delivery again.

Another potential solution lies in enabling the "access for lesser app" and "unlocking gmail captcha" settings. However, if these steps fail to rectify the issue, consider exploring the following approach:

1. Enable 2-Step Verification for Google: By adding an extra layer of security with 2-Step Verification, Google helps mitigate the risk of unauthorized account access.
2. Create an App Password: Instead of using your regular password, generate an app password specifically for the email sending system. This allows you to grant limited access to specific applications without compromising your primary password.
3. Update Environmental Variables: In your Laravel environment file, replace the original password with the app password generated in Step 2.
4. Restart Server: After updating the environment file, restart the Apache server to ensure the new settings are applied.

By following these steps, you can effectively resolve the "Username and Password not accepted" error and restore the ability to send emails through Gmail using SwiftMail. By addressing the underlying causes, such as spam flagging or security measures, you can maintain seamless email delivery and prevent future disruptions

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