pop3 server
mvn exec:java "-Dexec.mainClass=com.uchicom.pop3.Main"
mvn exec:java "-Dexec.mainClass=com.uchicom.pop3.Main" -Dexec.args="-port 8110"
mvn exec:java "-Dexec.mainClass=com.uchicom.pop3.Main" -Dexec.args="-port 8110 -keyStoreName keystore -keyStorePass changeit"
keytool -genkey -alias pop3 -keyalg RSA -keystore keystore -storepass changeit