It depends on what mail server do you use to send emails from your application.
If you just use IIS SMTP service then there is nothing to worry about as it will not route emails on the server without POP3 service.
The problem may happen if you have a MailEnable Mail server configured as it does has SMTP as well as POP3 configured within itself. In that case you will have to go to the config directory of mail enable, open DOMAIN.TAB file in notepad and remove your domains from it. This will allow ME to consider your domain as remote domain and not local.
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