<![CDATA[Failed to send email via SMTP]]>Your help in this issue has been very very useful.
Please suggest me to improve this SMTP issue.
Error Message as below:
Failed to send email titled "Mango test email" to "aji@***.com".
Message: "Mail server connection failed; nested exception is javax.mail.MessagingException: Could not convert socket to TLS; 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. Failed messages: javax.mail.MessagingException: Could not convert socket to TLS; 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"

MangoOS version 3.7.11
Java version jdk-8u311-linux-x64 or openjdk-8-jdk
mail server on MS Exchange Server 2016
TLS Crypt port 587
Use authorization

With my best regards,

Jenny

]]>https://forum.mango-os.com/topic/5475/failed-to-send-email-via-smtpRSS for NodeSun, 17 May 2026 00:33:24 GMTWed, 19 Jan 2022 02:22:10 GMT60<![CDATA[Reply to Failed to send email via SMTP on Wed, 09 Mar 2022 02:37:11 GMT]]>Hi!

This issue was solved today.
The Exchange 2016 server opened port 25 with TLS.
Tested mail was sent success.

]]>https://forum.mango-os.com/post/27323https://forum.mango-os.com/post/27323Wed, 09 Mar 2022 02:37:11 GMT