Since yesterday I am getting the following error while sending email via KNIME:
ERROR Send Email 0:3739 Execute failed: Error while communicating with the smtp server: javax.mail.MessagingException: Can’t send command to SMTP host;
nested exception is:
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
Do you know if it a problem related to KNIME or if it is related to the smtp server instead?