Can I send emails to values from a multi select text field?

Ok, so now its getting more complicated.

First of all, if these are actually users and not outside non-users, then just us a List User field because then you can multi select and also use it in an email Notification.

If these are outside non users, then one low tech solution is to make their dropdown choices in a format where you can directly parse out the email separate from the name. For example

Fred Flintstone - [email protected]
Barney Rubble - [email protected]

If you need help with a formula to parse out the email addresses, I can help you with that once you standardize on a format.  Like separating the name form the email address with a hyphen.