Mailer Error

SamerDeeB

Dear support team,

My osTicket system is sending emails correctly to both users and agents using the default email address. However, I am constantly receiving the following mailer errors in the dashboard:

Unable to email via SMTP: [alerts@x.com](mailto:alerts@x.com) (tls://smtp.office365.com:587/SMTP) SMTP AUTH is required for message submission on port 587
Unable to email via SMTP: [alerts@x.com](mailto:alerts@x.com) (tls://smtp.office365.com:587/SMTP) Cannot issue HELO to existing session

The mailbox is hosted on Exchange Online. MFA is enabled, and I tested using an app password, but the errors continued. I also tried disabling MFA and using the standard password, but I still received the same mailer errors. (Using Basic Authentication (Legacy)

I also tried no authentication same thing.

Is there anything I might be missing or additional configuration required on the Exchange side or within osTicket?

Thank you.

KevinTheJedi

SamerDeeB

Umm, O365 started forcing Modern Authentication (OAuth2) like a year ago at this point. You need to upgrade to v1.18.2, install latest build of the OAuth2 plugin, and follow this guide.

Cheers.