I ran into this issue some time ago. You can read my case details below:
Case Question (sent to SF)
I am seeing sporadic behaviour in the following scenario:
I have a Active subscriber on the All Subscribers list
Their SubscriberKey is 1234 and email is firstname.lastname@example.org
I do a real send from a data extensions to that same SubscriberKey (1234) but with a ...
My strongest hunch: These contacts are in Journeys, and Journeys can overwrite the All Subscribers email address with the email referenced on the Journey DE. So the email address on All Subscribers may be updated, but the Journey is switching it back
Default profile center being used in email sends with email address editable, on sends ...
These are all specific types of lists where Publication and Suppression Lists are specific types which are also useful when using the newer and more performant data extensions rather than the older lists.
Publication List / Suppression List: Used to manage subscriber's opt-ins to specific communication types for example. This are non-sendable lists of ...
There are two data models in Salesforce Marketing Cloud: Lists and Data Extensions.
What Is a List?
A list is a compilation of subscribers that receive your communications. You create as many lists as you want to segment your subscribers so that you can target your email communications.
Use the list model when:
your lists contain 500,000 subscribers or ...