Error 535 - Incorrect authentication data

1. A “Server says: 535 – Incorrect authentication data” error is usually related to the SMTP User Authentication details you have configured (or not configured) in your email settings.

2. This error is often reported by mail users who maintain multiple mail devices, and forget to update login details in one of their devices.

3. However, in very rare cases 535 Incorrect Authentication Data’ results when mailbox permissions are changed due to migrations, or an account/server update etc. I have ran a "Repair Mailbox permissions" which should resolve the issue if that's the case.

  • 19 Users Found This Useful
Was this answer helpful?

Related Articles

Import my contacts to webmail from another email account.

Webmail is fantastic for keeping up to date with your emails from anywhere in the world, but if...

How do I create a mailing list?

Login to cPanel. Locate the and click on the "Mailing Lists" icon within the "Mail" category....

How do I change my email password?

If you know your email password: Login to webmail. On the splash page, select "Change...

What are my POP and SMTP settings?

Your POP and SMTP mailserver settings are mail.yourdomain.com Example: Imagine your domain name...

Why does my IMAP connection keep disconnecting?

Check to ensure you don't have your Webmail open at the same time as accessing your IMAP mail....