[Users] Delete duplicated messages

[Ralph]

Hello!

3.17.6 (linux)

Due to an apparent recent change in the way my server is handling email
aliased at the server level, I'm getting duplicate copies of messages
(this is pop3). While I try to figure out how to reconfigure cpanel's
handling of the aliased email to deliver only one copy, how can I
temporarily 'fix' the problem at claws level? 

I know I can use the option under "Tools>Delete duplicated messages"
manually but is there an option somewhere to automatically do the same
thing after each 'receive'?

Thanks.

Ralph