Host your professional email on a secure, privacy-guaranteed, and ad-free email hosting service built-in with features like email marketing services can do.
Free email like @gmail.com, @yahoo.com, etc., doesn't give you a professional image in front of your business client. So, stop using that email. Stay professional with email@example.com.
PS. Kerjamail is by the same company as Kirim Email, and as far as I know, Kirim was one of the most popular and trusted email marketing lifetime deals by LTD lovers.