I also make a lot of introductions. There is one rule I always follow when I am considering connecting two people:
I ask myself, "Am I wasting anyone's time?"
It may sound harsh but this is a question that needs to be asked and honestly answered. Many times we are out there "networking" for networking's sake and taking meetings that don't make sense. The main question that should always be asked is:
Does this person actually want the introduction you are offering?
I always ask if the person already knows the person I am about to introduce. If not, then I reach out and ask if they feel that an introduction would be a good fit. If they tell me that it will be then I know to make the intro. I will also check in with the person I want to introduce and make sure it is an introduction that makes sense for them as well. It takes a little more time, but usually works out much better than just haphazardly connecting people.
So the next time you are about to send an email or make an introduction, stop and ask if it makes sense and find out if both parties are interested.
This leads to less time wasted and more time for win/win meetings.