Has anyone encountered this? Running Appian 7.8 Noticed that standard Appia

Certified Lead Developer
Has anyone encountered this? Running Appian 7.8
Noticed that standard Appian password reset emails weren't being sent out. Checked server logs and emails were failing due to:
javax.ejb.EJBException:
com.appiancorp.process.engine.EmailBodyException: Email body failed to render

Caused by: sun.security.validator.ValidatorException: PKIX path building failed:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

Full stack trace from server log attached. I'm not aware of anything that changed on the Appian server or on the network related. The configured email server is a server local on my network running sendmail.

emailbodyfailedtorender.txt

OriginalPostID-156066

OriginalPostID-156066

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