Email Module

Hi Guys,   Am currently getting errors when sending emails on Mendix 8.8.0 project.  Am running the latest module from the appstore and verified everything related to smtp details, encryption keys etc. and that seems fine but the send email java action keeps failing with stacktrace stating that it can't send email to my email server. The latest error I got as I keep trying it over and over was "unable to find the valid certification path to request target” Your input/help will be appreciated   Thanks,  
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