Posted by Introduction
Authentication failed errors commonly occur on servers when incorrect username or password details are inputted at login. The mail server rejects the wrong credentials, which results in this error.
Basically, we are a server management service provider and often receive queries to address authentication failed errors. This post is going to explain the reasons behind these errors and our server engineer’s method of fixing an “SMTP Error 535 Authentication Failed” message.
The reasons behind an “SMTP Error 535 Authentication Failed” message
Email clients use Simple Mail Transfer Protocol (SMTP) to send messages. If the server detects incorrect authentication, then it generates an error message of authentication failed. Different email programs will display diverse error messages, while others may not show any at all.
Common causes for SMTP error 535 authentication failed messages include
Wrong Username or Password
If you accidentally enter an incorrect username or password, then you will likely see the SMTP error 535 authentication failed message. Most users use their email address as their username and password for their mail servers.
In some cases, SMTP servers request different login details from your email account in order to ensure security. If you need help with this, then get in touch with your mail server administrator.
By improving the quality of email authentication, increasing email delivery rates, and reducing spoofing attempts, an organization can enhance the reputation of its brand
Disabled Account
Spamming issues and unpaid debts can result in your account being temporarily or permanently disabled. A disabled account can be another reason for receiving an authentication error message, so make sure your account is active by confirming its status. You should reach out to your support team if you experience any server issues.
Encrypting Connections
Because some servers need an SSL/TLS encrypted link, you may need to activate this. If it’s turned off, then you could get an SMTP error 535 message for authentication failed.
Authentication Technique
Error messages might appear if your email server doesn’t support your authentication methods. So, to fix expired or deactivated IP-based authentication, check the status of your account. Although rare, IP-based authentication errors can lead to an SMTP error of 535 messages for authentication failure.
How to Fix “SMTP Error 535 Authentication Failed”
- The first step is to log into your control panel and inspect the status of your account. You’ll usually get a notice if there are issues with your account.
- Double check the username and password associated with your email server. Remember that changing these details to something more secure is a good idea, and it also helps in recalling them the next time you log in.
- Block IPs that are constantly trying to access your account by adding them to the firewall on your server, which will stop them from trying again in the future.
- Turn on the SMTP authentication for both sides, the client and the server.
Plesk SMTP Authentication Activation,
Brief Steps,
- Login into the Plesk control panel
- Find Mail Server Settings under Tools &. Settings
- Choose Enable SMTP services in Relay Options
- If you’re having difficulties solving this issue yourself, you can contact the Plesk server management service providers.
cPanel’s SMTP Authentication Activation,
In WHM, authentication is off by default. Hence, you may need to enable it manually. I’ll walk you through how to do this.
- Go to WHM and choose Service Configuration.
- Pick the Service Manager.
- Select the Antirelayd checkbox next.
- For extra help, reach out to your cPanel server support provider.
How myEmailVerifier assists indirectly in fixing authentication failed errors.
Email validation via myEmailVerifier, while not directly resolving authentication failed problems, can enhance it indirectly by maintaining a cleaned-up email list. Here is how
- myEmailVerifier checks email address validity, removing any invalid or inactive ones from your list.
- This tool lets you validate multiple emails at once, aiding in the accuracy and cleanliness of your email list.
- A refined email list boosts the sender’s reputation, indirectly improving the authentication of said emails.
By employing myEmailVerifier’s offerings, the preservation of a spotless and accurate email register is possible. This allows for gradual elevation of your sender standing and regular supervision of your email performance. The result is an increase in the chances that your emails reach their destination without any struggle with authentication failed issues.