Been searching the help docs and I'm sure what I am after is possible but I cannot find the guide on how to set it up so any pointers would be most welcome please.

I have 5 different domains running email through zohomail, each with 1 email address. I'm looking for a way which I can create one account where all the mail for all 5 domains is viewable. I would then like to be able to compose a new email and select which account to send from using a drop down list of the addresses. I know you can do this in gmail but cannot work out how to get it up with zohomail.

Although I use Outlook to primarily check emails, it would be great if i were able to check all my inboxes at once rather than having to login 5 times 

Thanks

Carl