New product announcement: Your existing customers are your brand advocates. Therefore, do not let go of them. Let your existing customers know when you have got a new product or service offering. Since they are your existing customer, they are more likely to make a repurchase.
Testimonial email: This type of email can prove to be extremely powerful as hearing and seeing what your company has done for other clients in the past can build a sense of trust and provide proof of your business offerings. While using testimonial videos, bear in mind that the end goal is for customers to learn more about your company. Therefore, focus more on the good.
Tip: include case study for greater impact.