log4j-core/src/main/java/org/apache/logging/log4j/core/net/SmtpManager.java [281:337]:
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    public static class SMTPManagerFactory implements MailManagerFactory {

        @Override
        public SmtpManager createManager(final String name, final FactoryData data) {
            final String smtpProtocol = data.getSmtpProtocol();
            final String prefix = "mail." + smtpProtocol;

            final Properties properties = PropertiesUtil.getSystemProperties();
            properties.setProperty("mail.transport.protocol", smtpProtocol);
            if (properties.getProperty("mail.host") == null) {
                // Prevent an UnknownHostException in Java 7
                properties.setProperty("mail.host", NetUtils.getLocalHostname());
            }

            final String smtpHost = data.getSmtpHost();
            if (null != smtpHost) {
                properties.setProperty(prefix + ".host", smtpHost);
            }
            if (data.getSmtpPort() > 0) {
                properties.setProperty(prefix + ".port", String.valueOf(data.getSmtpPort()));
            }

            final Authenticator authenticator = buildAuthenticator(data.getSmtpUsername(), data.getSmtpPassword());
            if (null != authenticator) {
                properties.setProperty(prefix + ".auth", "true");
            }

            if (smtpProtocol.equals("smtps")) {
                final SslConfiguration sslConfiguration = data.getSslConfiguration();
                if (sslConfiguration != null) {
                    final SSLSocketFactory sslSocketFactory =
                            sslConfiguration.getSslContext().getSocketFactory();
                    properties.put(prefix + ".ssl.socketFactory", sslSocketFactory);
                    properties.setProperty(
                            prefix + ".ssl.checkserveridentity", Boolean.toString(sslConfiguration.isVerifyHostName()));
                }
            }

            final Session session = Session.getInstance(properties, authenticator);
            session.setProtocolForAddress("rfc822", smtpProtocol);
            session.setDebug(data.isSmtpDebug());
            return new SmtpManager(name, session, null, data);
        }

        private Authenticator buildAuthenticator(final String username, final String password) {
            if (null != password && null != username) {
                return new Authenticator() {
                    private final PasswordAuthentication passwordAuthentication =
                            new PasswordAuthentication(username, password);

                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return passwordAuthentication;
                    }
                };
            }
            return null;
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log4j-jakarta-smtp/src/main/java/org/apache/logging/log4j/smtp/SmtpManager.java [235:291]:
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    public static class SMTPManagerFactory implements MailManagerFactory {

        @Override
        public SmtpManager createManager(final String name, final FactoryData data) {
            final String smtpProtocol = data.getSmtpProtocol();
            final String prefix = "mail." + smtpProtocol;

            final Properties properties = PropertiesUtil.getSystemProperties();
            properties.setProperty("mail.transport.protocol", smtpProtocol);
            if (properties.getProperty("mail.host") == null) {
                // Prevent an UnknownHostException in Java 7
                properties.setProperty("mail.host", NetUtils.getLocalHostname());
            }

            final String smtpHost = data.getSmtpHost();
            if (null != smtpHost) {
                properties.setProperty(prefix + ".host", smtpHost);
            }
            if (data.getSmtpPort() > 0) {
                properties.setProperty(prefix + ".port", String.valueOf(data.getSmtpPort()));
            }

            final Authenticator authenticator = buildAuthenticator(data.getSmtpUsername(), data.getSmtpPassword());
            if (null != authenticator) {
                properties.setProperty(prefix + ".auth", "true");
            }

            if (smtpProtocol.equals("smtps")) {
                final SslConfiguration sslConfiguration = data.getSslConfiguration();
                if (sslConfiguration != null) {
                    final SSLSocketFactory sslSocketFactory =
                            sslConfiguration.getSslContext().getSocketFactory();
                    properties.put(prefix + ".ssl.socketFactory", sslSocketFactory);
                    properties.setProperty(
                            prefix + ".ssl.checkserveridentity", Boolean.toString(sslConfiguration.isVerifyHostName()));
                }
            }

            final Session session = Session.getInstance(properties, authenticator);
            session.setProtocolForAddress("rfc822", smtpProtocol);
            session.setDebug(data.isSmtpDebug());
            return new SmtpManager(name, session, null, data);
        }

        private Authenticator buildAuthenticator(final String username, final String password) {
            if (null != password && null != username) {
                return new Authenticator() {
                    private final PasswordAuthentication passwordAuthentication =
                            new PasswordAuthentication(username, password);

                    @Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return passwordAuthentication;
                    }
                };
            }
            return null;
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