Error 535 – Authentication Failed
When attempting to send an email, your email program may report an “Authentication Failed” error message. Authentication is the act of providing a user name and password. In this situation, your user name and password are required to prove that you are authorized to send email. If your mail server (also known as the SMTP server) rejects the user name and password, an Authentication Failed error will result. You will not be able to send any email until this problem is resolved, although it may not affect the ability to receive email.
Error
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535 Authentication failed
535 SMTP Authentication unsuccessful/Bad username or password
535 SMTP AUTH failed with the remote server
535 Incorrect authentication data
535 5.7.0 Error: authentication failed
535 5.7.0 …authentication rejected
535 5.7.1 Username and Password not accepted.
535 5.7.3 Authentication Unsuccessful
535 5.7.8 Bad credentials
538 Encryption required for requested authentication mechanism.
535-5.7.1 Please log in with your web browser and then try again.
Description of problem
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This error can have two meanings:
1) The username and password that you have entered into your program are incorrect and you are failing authentication
2) Your account has been disabled because of a problem
3) The SMTP server name could be wrong.
4) The account could be temporarily or permanently disabled. Contact the mail server’s administrator.
5) Some servers require that the connection be encrypted with SSL/TLS. Most email programs have an option that allows you to enable this feature.
6) You are using IP based authentication and your account has been disabled or has expired (uncommon)
7) It is IMPORTANT to note that for the first two causes this error will not be logged in the control panel, it will ONLY be returned to your email program / application.
How to resolve this problem
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To resolve this issue you need to take a number of steps:
1) Login to the control panel and check the status of your account to ensure it is not disabled for any reason – any issues would normally be highlighted for you
2) Check you are using the correct username and password
3) If you are unsure about your username and password you can use our password recovery function
4) If you have followed those steps and are unable to resolve the issue please login to the control panel and raise a support ticket.
5) Consider reducing your Email list to smaller increments i.e. 200 emails per list.