Please help us by providing the following info. Before posting please also check the pinned "Known issues" threads and make sure that you're running the latest available version for your oC release: https://owncloud.org/changelog/
Steps to reproduce
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Expected behaviour
Tell us what should happen
Only internal User receive mails but i cannot share files with external User. I cannot send mails to external user
Actual behaviour
Tell us what happens instead
The Mail is not send to external User
Server configuration
Operating system: Ubuntu 16.4 LTS
Web server: Apache 2.4
Database: MySQL
PHP version: 7
ownCloud version 9.1
Updated from an older ownCloud or fresh install: Fresh Install
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption):
NO
ownCloud log (data/owncloud.log)
Please paste possible errors in the following code block, see https://central.owncloud.org/t/how-to-find-webserver-or-oc-logfile-enable-php-logfile/808 for more info
Integrity status for oC9+
Login as admin user into your ownCloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.