In response to your other thread, I tested my own OJS 2.3.7 installation here, and went to Journal Manager -> Roles and successfully sent myself an email.
If it works for your sendmail test and not for OJS, you may want to examine the differences between the two sets of config files. It is also quite useful to monitor your mail log file in a shell window when you click 'send' to see what happens. When I debug these things I will use
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tail -f /var/log/maillog
(or whatever your mail log might be). When I submit the OJS form I immediately see whether or not the mail message is going to go out. If it bounces back, I'll see the reason right there, too.