I am a new user of Thunderbird. I have 4 email accounts. I am receiving multiple copies of emails both on my desktop and also on K-9 on my phone. From reading the various entries on this support site I note this is a known problem. I have not found any posts that offer a solution. Is there a solution? Do I need to run diagnostics to clarify my issue if so what diagnostics? Thanks in advance. Regards, Mike Duffy