In our Hybris Marketing system, the E-mail address is customized as "shareable".
So more than one customer can have the same e-mail address.
This is required in case e.g. husband and wife share an e-mail address, but we do want to have both of them as customer, and in personalized mails such as a Happy Birthday or a different campaign for men and women, we want to address both.
However if we send a general campaign such as a newsletter, which does not contain any personalization, both of these customers with this same e-mail address are in our target group. So they get the exact same mail twice in their mailbox, and this can be very strange for this customer. (there's even cases where a same e-mail address could get the same mail 4 times)...
So my question is, if there is a way to filter out duplicate e-mail addresses for certain campaigns / segmentations?