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[Solved] smtplib.SMTPAuthenticationError: (535, ‘5.7.3 Authentication unsuccessful’)

Hello Guys, How are you all? Hope You all Are Fine. Today I get the following error smtplib.SMTPAuthenticationError: (535, ‘5.7.3 Authentication unsuccessful’) in python. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How smtplib.SMTPAuthenticationError: (535, ‘5.7.3 Authentication unsuccessful’) Error Occurs?

Today I get the following error smtplib.SMTPAuthenticationError: (535, ‘5.7.3 Authentication unsuccessful’) in python.

How To Solve smtplib.SMTPAuthenticationError: (535, ‘5.7.3 Authentication unsuccessful’) Error ?

  1. How To Solve smtplib.SMTPAuthenticationError: (535, '5.7.3 Authentication unsuccessful') Error ?

    To Solve smtplib.SMTPAuthenticationError: (535, '5.7.3 Authentication unsuccessful') Error
    This Problem is With Your Gmail if You double checked Your credentials. You Can do following steps to resolve it:

  2. smtplib.SMTPAuthenticationError: (535, '5.7.3 Authentication unsuccessful')

    To Solve smtplib.SMTPAuthenticationError: (535, '5.7.3 Authentication unsuccessful') Error
    This Problem is With Your Gmail if You double checked Your credentials. You Can do following steps to resolve it:

Solution 1

Actually, when I tried executing the same statements on python console, I came to know that the password was incorrect and it was due to different character encoding.

For all other users, refrain yourself from copy paste

Solution 2

This Problem is With Your Gmail if You double checked Your credentials. You Can do following steps to resolve it:

1.Enable IMAP and/or POP3:

 1. Go to the "Settings", e.g. click on the "Gears" icon and select
    "Settings".
 2. Click on "Forwarding and POP/IMAP".
 3. Enable "IMAP Access" and/or "POP Download"
  1. Allow Less Secure Apps to sign in Your Gmail.
 1. Login with your gmail account and find "Allow less secure apps:"
    from [Here][1]
 2. Google manages security with your gmail account. You need to turn on "Allow 
      less secure apps:" and you will receive mail in your gmail account.
      [1]: https://myaccount.google.com/security#activity

Summery

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you? Thank You.

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