Ask HN: Email service where I can use multiple send accounts

Good morning HN,

I've been doing some light email marketing using MailChimp to validate some ideas. At the moment I have three different things I'm working on which - unless I've missed something - means I have to log in and out of MC for each different campaign.

Is there an email tool out there that allows the user to toggle between accounts with, say, a dropdown or something? I don't mind paying and was already looking at PersistIQ and Salesloft. I just want the convenience of logging in and being able to add prospects or send a new mail or whatever without having to log in and out.

Thanks for your help, have a great weekend.