A professional thank you letter, whether hard copy or email, helps build and maintain relationships in the professional world. It’s important to let colleagues, employers, vendors, networking contacts and other contacts know that you value their time and efforts.
Sending a thank you letter is a good way to build rapport with your network and communicate your future intentions. Situations that warrant an acknowledgement:
Being provided with a new networking contact.
Getting a lead on a good job possibility.
Following an in-person or video interview
See an outline of a typical letter contents here.