[FIX] mail: faster blacklist search
[FIX] mail: faster blacklist search

For the special case of is_blacklisted, and due to
the size of the tablers to handle, it's faster to
filter some records rather than searching the whole
res.partner table

closes odoo/odoo#28028
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo