Let’s fix the “535 authentication failed” in Nodemailer. At Bobcares, with our Server Management Service, we can handle your Nodemailer issues.

Fixing “535 authentication failed” in Nodemailer

The error message “535 Authentication Failed” appears when using Nodemailer, a popular Node.js package for sending emails. The error indicates that the SMTP server’s verification process has failed. The common protocol for sending emails over the internet is SMTP.

When using Nodemailer to send an email, we must normally give the logins of the mail account we want to use to verify with the SMTP server. This ensures that only authorized users are able to send emails via the server.

The error may occur from incorrect credentials, account security features, settings, firewall/network issues, or a down SMTP server.

Steps to fix the 535 error in Nodemailer

1. Check SMTP Credentials: Ensure that the username, password, SMTP hostname, SMTP port, and protocol (SSL/TLS) are correctly configured and include accurate data.

2. Setup App Passwords: If we try to authenticate to an account with 2-FA using a password with certain providers, such as Zoho, we will most certainly see this error. In such cases, we must develop a unique app password and enter it into the Nodemail setups.

3. Allow for Less Secure App Access: In order to allow authentication, enable “Less Secure Application Access” on SMTP servers such as Google.

4. Disable firewall and anti-virus security: We can reconnect after disabling the firewall or anti-virus software. It will also help us fix the problem.

[Need to know more? Get in touch with us if you have any further inquiries.]

Conclusion

The article points out some of the possible causes of the “535 authentication failed” in Nodemailer, along with the solution from our Tech team to fix it.