Could not Connect to SMTP Host - SSLHandshakeException

Hello, Dear Community Members,

I hope everything's okay.

IFS cannot send e-mail. I see the error javax.net.ssl.SSLHandshakeException in the application messages.
I have analysed similar messages in the community (@Yasas Kasthuriarachchi @dsj) but I can't find any result. 

Can you help me what to do?

Error while sending data... 
Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465 
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Best regards

Barış