MailControl binding not working

This is the error i get in the logs when trying to save my mailcontrol.cfg file.

[ERROR] [org.apache.felix.configadmin ] - [org.osgi.service.event.EventHandler,, id=296, bundle=186/file:/C:/Users/martin.krandarov/Downloads/openhab-2.1.0/addons/org.openhab.binding.mailcontrol-1.11.0-SNAPSHOT.jar]: Unexpected problem updating configuration org.openhab.mailcontrol
java.lang.VerifyError: Bad type on operand stack
Exception Details:
org/creek/accessemail/connector/mail/MailConnector.getPop3Store()Ljavax/mail/Store; @31: invokevirtual
Type ‘com/sun/mail/pop3/POP3SSLStore’ (current frame, stack[0]) is not assignable to 'javax/mail/Store’
Current Frame:
bci: @31
flags: { }
locals: { ‘org/creek/accessemail/connector/mail/MailConnector’, ‘javax/mail/URLName’, ‘javax/mail/Session’, ‘com/sun/mail/pop3/POP3SSLStore’ }
stack: { ‘com/sun/mail/pop3/POP3SSLStore’ }
0x0000000: 2ab4 0004 b600 514c 2ab4 0004 b600 1601
0x0000010: b800 174d bb00 1859 2c2b b700 194e 2db6
0x0000020: 0052 2db0

at org.openhab.binding.mailcontrol.connection.ConnectorBuilder.createAndCheckMailConnector(
at org.openhab.binding.mailcontrol.internal.MailControlBinding.updated(

Looks like update is getting called before the file is finished writing to disk.
Try saving the config file after shutting down OH.