Issue with smtp server

I community,

I’m testing the send by email but I got this error:

An error occurred while trying to send an email! (triggered 20 minutes ago)

The Graylog server encountered an error while trying to send an email. This is the detailed error message: org.apache.commons.mail.EmailException: Sending the email to the following server failed : (javax.mail.MessagingException: Could not convert socket to TLS; nested exception is: PKIX path building failed: unable to find valid certification path to requested target)

So my smtp server only need auth and not TLS…I’m confuse about this, could you help me, please?

Thanks in advance

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