If you give a talk at a conference or business event, always give out your email address from the platform and offer to give your audience something if they email you.
You could offer a PDF with some tips from your talk, a recommended reading list or your power point presentation. You could also ask them to send you an email with their stories or comments.
If you do this, you’ll be surprised at how many people email you and begin a conversation, and maybe a productive relationship. Don’t miss out on a opportunity to convert a presentation into a valuable networking exercise. Sure, you might get a bunch of emails, but there’s gold in there!