"Checking your email regularly is essential for maintaining professionalism and upholding your reputation. Promptly responding to emails demonstrates your commitment to communication and professionalism. It also helps in building trust and credibility with your colleagues, clients, and business partners."
As a consultant, I have provided email marketing as one of my services for many of my past clients. If you wish to secure your service, you must reply back to the email.
It is no longer the past and if you are just now checking emails regarding past events, please refrain.