I would like to echo the comments already made on this topic.  It would be incredibly useful for our company as well - especially now that authentication is being required by the system.   We are a holding group with a few different operating entities - separate logos, brands, products.   We are unfortunately at this time, going to be looking for alternative services that have multi domain support.   This is not a new need, and despite our long relationship with Constant Contact and its platform, with the authentication issue, we realize that we will be unable to use multi domain emails to send, without setting off red flags.  Having separate user accounts (which... if that is a business move to double down on subscriptions... I could understand that) - is not efficient for our business, as it would require the "recreation" of all communications, and management of all contact lists, in up to 7 different accounts.  Rather than copy / update.  It is not feasible.  Wish this feature would be considered higher on your list.    ... View more