Previously, users imported from LDAP had no verified mail address causing
many problems with Postorius and Hyperkitty.

Also prevents users from changing their username, first name or last name.

Fixes #3

LDAP errors were previously misinterpreted as an empty set of results, causing
mass-unsubscription of list members.

Fixes #1

fixup! handle multiple mail addresses and cancle any subscription requests for addresses we try to subscribe

handle multiple mail addresses and cancle any subscription requests for addresses we try to subscribe