[Users] Multiple accounts

[Ken Parkes]

I switched to Claws recently after horrendous problems trying to
recover my address lists after a Thunderbird crash.  Claws was the
only mailer that could make sense of much of my recovered
files. so I'm a novice here.
Looking through back posts today I learnt
how to have multiple email addresses (Config.,Edit accounts etc.).  I
added a new email address and tried contacting myself through it -
perfect.  Now all my email is arriving in duplicate. How do I stop
this please?

Ken