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Gmail issue for apps

We've got sometimes troubles for sending emails using our backend APIS for sending emails and even if you've got the Less secure app access enabled it just doesn't allow you to send any emails from your backend side

so do this in that case:
  1. Open your web browser and sign in to Gmail at http://mail.google.com/mail. If you see a word verification request, type the letters in the distorted picture and finish signing in.
  2. Close your browser and try accessing your messages in your email client again.
  3. If you're still having problems, visit http://www.google.com/accounts/DisplayUnlockCaptcha and sign in with your Gmail username and password. If necessary, enter the letters in the distorted picture.
  4. Click Continue.
  5. Restart your mail client and try accessing messages in your email client again.

SMTP Error: Could not authenticate
Gmail issue

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