For StartTLS support to work for inbound email, you
must configure SSL for Java.
To identify whether you are having this problem, enable DEBUG logging for the class org.subethamail in your log4j.properties file.
startTLS() failed: no cipher suites in common
Also, to enable efficient inbound mail server logging in debug mode, you need a
log4j option that allows you to track mails, including the sender
details, recipient details, subject and the reason for rejection/acceptance. To do so, enable
DEBUG logging for the class
org.subethamail.smtp.server.ConnectionHandler as shown below:
log4j.logger.org.subethamail.smtp.server.ConnectionHandler=debug
The following process outlines one method for creating a self-signed certificate. However, this may differ between JVM vendors, so see the JVM documentation for more information.
- Create a suitable key and certificate:
keytool -genkey -keystore mySrvKeystore -keyalg RSA
- Add the following somewhere in your Tomcat configuration. For example,
/etc/tomcat5/tomcat5.conf.
JAVA_OPTS="$JAVA_OPTS -Djavax.net.ssl.keyStore=mySrvKeystore -Djavax.net.ssl.keyStorePassword=123456"
Note: This method explains how to create a self-signed certificate only. SSL vendors can provide
certificates signed by an authority and may be more suitable for production use.