I am using OJS on the CentOS Linux release 7.6.1810 with SELinux. Everything was working just fine before I have upgraded it to version 3.1.1.4. The upgrade to this version also required the upgrade of PHP so I upgraded it from ver. 5.4 (from centOS repository) to version 7.2 (from remi repository).…

Ph_We January 19, 2019, 2:14pm 9

As for us, we did not change anything. It just came after upgrading to 3.1.1.4 too:

OJS stopped sending mails after upgrade from 3.0.2.0 to 3.1.1.4