Can multiple email addresses *with names* be pasted into Mail.app?
The expected format for multiple e-mail address is:

Joe Blow &lt;joe@blow.com&gt;
Jimmy Dean &lt;jimmy@dean.com&gt;
Sally May &lt;sally@may.com&gt;


Copying and pasting this into Mail.app on macOS 10.12 works as expected. Three people are added to the e-mail; each with their name associated with the e-mail address.

Individual entries can be separated by a comma:

Joe Blow &lt;joe@blow.com&gt;, Jimmy Dean &lt;jimmy@dean.com&gt;, Sally May &lt;sally@may.com&gt;


The angle bracket format originates from RFC 822 Section-6.1. This Request For Comment (RFC) defined the basis of the e-mail standard used on the Internet.