logback-android/src/main/java/ch/qos/logback/core/net/SMTPAppenderBase.java
public void start() {

    if (cbTracker == null) {
      cbTracker = new CyclicBufferTracker<E>();
    }

    session = buildSessionFromProperties();

    if (session == null) {
      addError("Failed to obtain javax.mail.Session. Cannot start.");
      return;
    }

    subjectLayout = makeSubjectLayout(subjectStr);

    started = true;
  }
public void start() {

    if (cbTracker == null) {
      cbTracker = new CyclicBufferTracker<E>();
    }

    session = buildSessionFromProperties();

    if (session == null) {
      addError("Failed to obtain javax.mail.Session. Cannot start.");
      return;
    }

    subjectLayout = makeSubjectLayout(subjectStr);

    started = true;
  }
Start the appender