Email Setup Issue - OJS 3

[Vitaliy]

As for spam issue, take a look at this thread:

SMTP emails go to spam

Greetings, For sending emails from OJS 3.0.2, we use own email server with DKIM and SPF. For some period we have been using direct SMTP email sending. But in this case, it often goes to the recipient’s spam folder. Direct emails, bypassing OJS, are received normally. As are those, sent by PHP mail() function. Moreover, once activated, we cannot turn off SMTP. It works even after commenting out appropriate lines in the config file. From where I can start a search of the problem’s roots?