Please contact firstname.lastname@example.org to help you with this
You can now add domains to a list and recipients with those domains will not be able to opt out from your campaigns. You can add or remove domains from this list by navigating to Settings > My Settings > Preference Centre > Prevent opt outs from internal/corporate staff
Which then presents you with this pop-up where you can add the domain
This feature is useful if your campaigns are sent internally and contain critical company information.
Recipients which this option has been enabled for will be able to click on the campaign's opt out/unsubscribe link, but will see the message below in the subsequent Preference centre:
Sorry, your email address cannot be opted out from this sender due to policies established by your administrator. Please contact them for additional information.