Steps to reproduce
1. Configure working owncloud server, https etc.
2. attempt to set up smtp tls mail with exchange 2010/2013
3. ensure selinux has httpd sendmail on, ensure exchange has relay open for known owncloud server IP
Tell us what should happen
owncloud should relay mail through exchange 2013 server
Tell us what happens instead
owncloud fails to test sending mail when working with any permutation of relevant smtp send settings (25, 465, 587, 993 etc.). neurotically verified that any combination of u/auth does not work on any port, IP or FQDN. note that even my xerox copiers on site work with the exchange server over the same protocols (and several other IIS webservers for that matter).
Operating system: CentOS 7
Web server: apache/httpd
PHP version: 7
ownCloud version (see ownCloud admin page): 9.04
Updated from an older ownCloud or fresh install: fresh (prince of bel-air)
Special configuration (external storage, external authentication, reverse proxy, server-side-encryption): external auth - yes - ldap working 100%
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
A problem occurred while sending the email. Please revise your settings. (Error: Unable to connect with TLS encryption)
Integrity status for oC9+
No errors have been found.
Noting all of the above - does anyone have settings/config suggestions or a centos settings I may be missing? I've verified that selinux has been calmed down on sendmail for httpd, but perhaps there is something else I am not aware of blocking it. Perhaps firewallcmd that I need to run?