RE: Send out transactional Emails
Hi, I guess by transactional you mean an individual email with an account update or something like that and not marketing.
This is already possible with customer journeys.
There is a new feature that's been rolling out this last week, which allows you to send an email to a single contact (or up to 30 contacts)
It saves you having to create a customer journey and a segment. Although it does still create those things behind the scenes. It's a bit clunky and not a patch on the "quick Send" feature of ClickDimensions.
There are also one or two bugs with this new feature, but its a starting point.
Personally, I think for the time being that Outlook is your best bet for transactional email.