#12 abook: switch to detect duplicate emails

[Denis Briand]

Hello,
see: https://bugs.debian.org/404716

filippo wrote:

Hi,
it would be great if abook can check for duplicate emails when using
--add-email, right now it adds contacts no-matter-what.
My rationale for this is that I'm having abook receiving every mail in
my inbox, so I have contacts added automatically.

I think its a good idea.
Please add this feature if its possible.
Thank you

Denis Briand