SSL Certificate Validation for Mailserver fails

[LordRazor]

When setting up a Mailserver with activated SSL Certificate Validation, monit fails to send Emails and throws the following Error:

[CET Feb 17 14:27:43] error    : Mail: SSL server certificate verification error: unable to get local issuer certificate
[CET Feb 17 14:27:43] error    : SSL: write error -- error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
[CET Feb 17 14:27:43] error    : SMTP: Error sending data to the mailserver -- Success

It works perfectly fine without the Certificate Validation.

[Tildeslash]

It seems that the CA certificates in monit's default path doesn't contain the related certificate.

You can set the path via "set ssl" statement, please see cacertificatefile/cacertificatepath options: https://mmonit.com/monit/documentation/monit.html#SSL-OPTIONS