In today's day and age sending a thank you email feels weird for some, but it is still one of the sure fire ways to build strong relationships and keep lines of communication open. You do that by sending a thank you email after every business meeting. Sending a thank you email or recap email can help summarize quickly what was discussed, and where things are going. Then list any action items, for you or them. It builds the relationship beyond the meeting, and can be a handy reminder of what happened for all involved.