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[bog]

Dear @mathwise and @shaun,
which version you are using? In OJS 3.1.2 Global Sender is implemented, so the only need is one email address, which is from your mail server, so nobody will see it as spam.
Have a look at this thread:

Good way to change the sender email address

Dear @ajnyga, we have upgraded our test server to OJS 3.1.2, but we do not see this option to use global sender. Could you show me where can it be set? Thanks in advance, Bogi

just set your config in the indicated file, and it works like a charm.

Cheers,
Bogi