/SFMBE
Of course, You have some security concerns, but I think, SME will be used for home purposes mainly, without this feature.
1. Because a lot of employers and company managers wouldn't agree the "password keeper"/admin/ and/or other people to access 'easily' their own mailboxes.
2. If the admin leaves a company of 200+ people, the new IT should change the passwords of 200+ e-mail accounts and give to 200+ employees to learn their new passwords.
In this sense, I think it's better to be implemented some additional options:
1. In admin panel - 'user can and can not change his password in mailbox'.
2.'Login (IP, date, hour) history view' option in SME, previewing in the users mailboxes.
3. An additional option of 'E-mail password', different from 'Collaboration' one or different e-mail users and passwords from 'Collaboration' ones.
Respect and many thanks to the devs and supporters for the excellent work, time and money they invested in this wonderful project!