[FIX] mail: use strict email matching for bounces

When a bounce is received, we look for matching partners in order to
increment the bounce counter. However by using [`ilike','email`] we carry
the risk of matching emails that contain the bounce email:

   ['email', 'ilike', 'john@hitmail.com´]

will also match 'random.john@hitmail.com' for example.

Using strict equality is safer, and the worst that can happen is that
we fail to count one bounce.

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