Settings - Email marketing

General
Newsletter unsubscription page URL	Sets the URL of the page where users can unsubscribe from an newsletter. The Unsubscription web part must be placed on the specified page to ensure the required functionality. The value of this setting is inherited by individual email campaign if their Unsubscription page URL property is not set. If empty, the ~/CMSPages/Unsubscribe.aspx default page is used.
Double opt-in approval page URL	Sets the URL of the page where users can confirm their subscription to a newsletter with double opt-in enabled. The Subscription approval web part must be placed on the specified page to ensure the required functionality. The value of this setting is inherited by individual email campaign if their Approval page URL property is not set. If empty, the ~/CMSModules/Newsletters/CMSPages/SubscriptionApproval.aspx default page is used.
Double opt‑in interval	Sets the length (in hours) of the time interval during which users will be allowed to confirm their subscription to a newsletter that uses double opt‑in. If a user does not activate their subscription within the specified number of hours, the link in their confirmation email will expire and become invalid.
Opt-out list	Opt-out list is shared between all sites - suitable if all sites on the instance are related. That is, visitors subscribe to all campaigns on all sites at once. Opt-out list is separate for each site - suitable if sites on the instance aren’t related. That is, visitors subscribe to site campaigns individually. Changing the behavior on a production site: Switching to Opt-out list is shared between all sites removes all subscribers in the opt-out list from all campaigns on all sites. They will not receive campaign emails from any sites. Switching to Opt-out list is separate for each site activates all email campaign subscriptions except for those on the site where the subscriber originally chose to “unsubscribe from all campaigns”.
Generate campaign emails if emails are disabled	If enabled, campaign emails will be generated and saved into the Email queue even if sending of emails is disabled in Settings -> System -> Emails.
Use external service for dynamic newsletters	If enabled, the scheduled tasks that are created to ensure the mail‑out of new dynamic newsletters will be set to be processed by the external scheduling service by default. Note: this does not change the settings of existing dynamic newsletter tasks. If you wish to configure these to use the external scheduler Windows service, you will have to enable their Use external service property manually in the Scheduled tasks application (remember to select the appropriate site, these tasks are not global).
Bounced emails
Monitor bounced emails	Indicates if bounced emails should be tracked for email campaign subscribers. Bounced emails are received whenever there is a problem with the delivery of a campaign email to a subscriber.
Bounced email address	Sets the address to which bounced emails are sent when the delivery of a campaign email to a subscriber fails. If set, this address is used in the From field of campaign emails.
Bounced email limit	Sets the amount of bounced emails that can be counted for a subscriber before the system blocks them from receiving further campaign emails. This limit is set for all email campaigns under the selected site. If 0 is entered, subscribers will never be blocked automatically, but their bounced email count will still be tracked and displayed in the Email marketing application.
Block subscribers globally	If checked, bounces will be added to all subscribers that have the same email address. This is applied across all sites in the system. Note: this setting does not ensure consistency between the bounce counts of all subscribers with a shared address, only that new bounces will be added to all of them. This field is only available when defining global settings, i.e. when the (global) option is selected from the Site drop-down list.
POP3 settings
Server name	Sets the address of the mail server where the bounced emails are stored. POP3 is used to check the server and monitor bounced emails.
Server port	Specifies the number of the port used to connect to the mail server.
User name	Sets the user name used for authentication against the mail server.
Password	Sets the password used for authentication against the mail server.
Use SSL	Indicates whether the connection to the mail server should be secured using SSL.
Authentication method	Allows the selection of the authentication method used for the connection to the mail server. Options include basic user name and password authentication and several challenge‑response mechanisms. The Auto option uses APOP if the server supports it and plain text user name and password authentication otherwise.