Cannot Send Emails

Hi, I cannot send emails. I tried my web server's default mail server, Gmail, and Amazon SES. Nothing works.

This is the error: authentication failure [SMTP: Invalid response code received from server (code: 535, response: Incorrect authentication data)]

It's saying Incorrect authentication data which means the credentials you've provided is not correct. With GMail you must do a couple of things:

Also, if you have 2FA enabled then you need to create an App Password and use that as the "Password" in the osTicket email configurations.

Cheers.