User isn't notified upon sharing by e-mail

[masem]

1. After creating share by e-mail, user who created it isn't notified that e-mail was sent.

Expected behaviour

Send CC, BCC or notification to user who created share. This way
user have, at least partial confirmation, that e-mail was delivered.

Actual behaviour

User doesn't know if e-mail was passed to mail server or if it was rejected or lost.

Server configuration

Operating system:
Centos 7

Web server:
Apache 2.4.6

Database:
Mariadb 5.5.56

PHP version:
7.2.5

Nextcloud version: (see Nextcloud admin page)
13.0.6

Updated from an older Nextcloud/ownCloud or fresh install:
Fresh Install

Where did you install Nextcloud from:
Git

[nextcloud-bot]

GitMate.io thinks possibly related issues are #9698 (Search is not working in Shared Folders by Other users), #3388 (Turn off option to share by mail), #10903 (users is not defined when sharing.maxAutocompleteResults is set), #10534 (Email notification is not sent upon directory share to group of users), and #6707 (User cannot move shared file to shared folder).

[wiswedel]

Users should give the server some trust to actually carry out what it's been ordered to do.
Notification and BCCs should be used sparingly.