How to reply to mail for how are doing

Here are a few examples of how you could reply to a "how are you doing?" email:

Short and Sweet

A Little More Detailed

A Bit More Formal

A Funny or Lighthearted Response

Remember to always be genuine and sincere in your response, and to keep it concise and easy to read. You can also add a personal touch by mentioning something specific that's been going on in your life, such as a recent trip or a new hobby.