Assegnate 4 su 5 stelle

This is undoubtedly an EXCELLENT addon - used it now for a number of months. Well done Alexander, you are a star ..HOWEVER, my system just auto-updated the Thunderbird program, and now whenever I send a mailmerge out, if the outgoing mailmerge is interrupted by an incoming email (ie sometimes sending to a user who has an OutOfOffice reply), then the mailmerge simply stops and there is no way to restart it without exiting the program (delete all users on the address book already been sent an email) and restart it .
As we have 500+ addresses, I needed to restart this 4 times!
This never used to happen - will an update fix this or what can I do? Many thanks