IFS fails to send email through an external SMTP provider with a `SSLHandshakeException`/`PKIX path building failed` error, even though the SMTP host, port, and credentials are all correct.

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Answer

This points to the mail server's TLS certificate chain not being trusted by the Java runtime IFS's mail-sending component uses — export the SMTP provider's certificate (via a browser, viewing the site's certificate) and import it into that Java runtime's trust store using keytool -import -trustcacerts -keystore <path-to-cacerts> -storepass changeit (with an alias identifying your environment), then retry sending mail; a missing intermediate or root CA certificate in the trust store used by the specific process making the SMTP connection is a common cause of this exact PKIX-path error even when every other mail-sender setting is correct.

Documentation-based answer. Confirm the product and release before applying it. This answer has not been verified in an IFS environment.

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