API to get mail user details for all account that belong to a client.

I'm missing an mail_user_get_all_by_client api function.

mentioned in merge request !1599 (merged)

added Feature Request label

marked this issue as related to #6333 (closed)

mentioned in commit 4c83fa6e

mentioned in commit bb50b985

closed with merge request !1599 (merged)

changed milestone to %3.2.9

added Implemented label