Getting Error When sending out email and also cannot send out email from crm

Getting Error When sending out email and also cannot send out email from crm

Getting the following error when trying to send out email.



Reason:sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target. Your Mail has been placed in outbox for retrying