Mailbox client for a contact's mailbox

akwizgranrequested to merge
2289-client-for-contacts-mailbox into master

This branch implements the mailbox client for a contact's mailbox. I decided not to create an abstract superclass shared with the client for our own mailbox, as most of the shared code was already encapsulated in the ConnectivityChecker.

Closes #2289 (closed)

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