Is all MA email-centric?

Are all MA products email unique (as in there is only allowed 1 copy of an email in the whole system). The organization I am working with uses a CRM that allows for multiple members to use the same email. As well, their members tend to change emails frequently throughout the year. They have had a hard time finding a MA system that can handle these requirements. Specifically, members sharing emails and members changing emails frequently but retaining a history of activities as a single member. Thoughts?
submitted by /u/falsepremise2way [link] [comments]