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Your Oempro can accept the subscription and unsubscription requests through an email. If a user wants to subscribe or unsubscribe from a list they can send an email to a specified email addresses provided by the list owner and the user can send an email to this particular email with the pre-defined subject line for subscribing or unsubscribing.
The Oempro backend will fetch these emails either using POP or Email Piping/CLI based monitoring methods.
You can use the drop down and select the suitable method.
If you are selecting Email piping/CLI method you will need to provide the execute rights for the cli module called "requests.php" found under the "/path_to_oempro/cli/" directory.
If you select POP3/IMAP Connection then you will need to populate the hostname, port and username password for the pop3/imap account.