SMTP AUTHENTICATION FAILURE

Here is the Error message:

SMTP authentication failure: authid=nezo@nitda.gov.ng, authtype=LOGIN, client_ip=163.123.143.88, detail=SASL(-1): generic failure: checkpass failed

Hi Firdausi,

 SMTP Auth is just the protocol extension that allows a client to use Authentication when sending a message . The shared message means the authentication failed for the specified user "nezo@nitda.gov.ng".

Is this a legitimate user in your network? If not, it is not an issue they tried to login with some random password and it failed. If it is legitimate user , please validate their credentials.

Below articles will share some more details.
https://community.fortinet.com/t5/Support-Forum/SMTP-Auth-Failures-on-Fortimail-How-to-prevent/td-p/225406

https://community.fortinet.com/t5/FortiMail/Technical-Tip-How-to-disable-SMTP-Auth-Failure-log/ta-p/196245