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
1.Place file in account
2.attempt share file to a remote email address
3.get error pop up window "Sharing 20161224_120354.jpg failed, could not find firstname.lastname@example.org, maybe the server is currently unreachable.
Allow the file to be shared via link to remote email addresses.
Sharing 20161224_120354.jpg failed, could not find email@example.com, maybe the server is currently unreachable.
Operating system: Ubuntu 16.04 Server
Web server: Apache 2
PHP version: ? New Install
ownCloud version (see ownCloud admin page): 9.1.3
Updated from an older ownCloud or fresh install: Fresh
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): Storage is an NFS share on different server in same network(Local)
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.