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Plesk 12 smtp differences? (Firewall)

kpmedia

New Pleskian
SMTP (submission port) server
SMTP (mail sending) server

- Does one accept the mail on port 25?
- While the other only controls/allows smtp logins?

If so, which is which?

If not correct, then what are the differences?
 
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To protect your server against unauthorized mail relaying or injection of unsolicited bulk mail and allow your customers to send email messages through the port 587 you may use submission.
 
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