I have this issue

I have a driver set up to auto create e-mail addressses Works Fine for New
Users (I create e-mail adresses on placement rule)

On the first time sync via jdbc driver do I match useres allready having
this E-Mail Adresses works fine, but the e-mail Adresses get deleted in IV
(destination store). It Also get deletede on re-synchronization

The Scheme rule do not have a mapping for this field, but the filter is
set to syncronize on publischer channel.default merge

Only data on the publischer channel is used.

How can I prevent this attribute on iv (destination store) NOT TO BE
DELETED on Match.

should I match on existing users int the IV.