"Throttled Send" Feature?

Is there a way to send an email to a list over a period of time?

With the increase in webmail bots generating link previews and security scans, our web servers are getting bumrushed when we send to a large list. The problem is that bots are automatically opening received email and scanning all the link contained therein. We get thousands and thousands of hits in the span of a minute or two.

We would like to feather out the sending rate to prevent this sudden traffic glut. Is there a way to do this besides manually splitting lists up?