I really like that it's easy to add multiple domains, as well as adding many additional email addresses for use with our campaigns in MailChimp or other platforms! It would be nice if you could have an option where you can specify exactly which emails are being pulled into your list versus just pulling from all inboxes across the domain (i.e., having no filtering).
That way we don't need separate lists per site/domain when there may only ever be one member at each location who wants us marketing their organization but not wanting them contacted by everyone else working within the same office environment; however they do want some communications going out via internal channels so this works great. As long as people aren’t actively blocking messages coming through different servers then its fine!! We've also found using global data helps cut down substantially on spam complaints because sometimes users will put filters up.