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osTicket v1.10 (stable) and Maintenance Release v1.9.15 are now available! Go get it now

authentication failure [SMTP: SMTP server does not support authentication (code: 250, response: BN6P

I switched over to office365 and keep getting this error for the smtp server. I have linked a few other servers with similar mail function to the same address and same credentials, they work. Not really sure where to start on solving this issue....

authentication failure [SMTP: SMTP server does
not support authentication (code: 250, response: Hello []
SIZE 157286400


  • The error being returned is "SMTP server does not support authentication". Have you tried disabling SMTP Authentication in osTicket?
  • Ya, It will say its successful, then I try sending a test email and no email is sent. So far what I have found out is, if anything is linking to O365 it has to be authenticated. I also have a few other devices/services sending emails out as well authenticating through the smtp server. But what is really getting me about this problem is that it says the server does not support authentication (SMTP server does not support authentication) but yet it needs to authenticate (STARTTLS)... if I reading the errors correctly.
  • did anyone ever resolve this issue?, have been reading the forums for hours and trying various different methods to get email working as I have exactly the same error message.
  • We setup the SMTP service on a local machine.
  • edited February 5
    For O365 please see config as attached.

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  • Attachment
    533 x 596 - 62K
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