Do you use email channel to promote your business?

According to an eMarketer study, the median email marketing ROI is 122%. That’s four times higher than any other digital marketing channel.
So, I was wondering how you use emails to promote your products or services?

For example, let's take an email signature. Creating a compelling email signature can become a powerful method for generating leads and new business through targeted CTAs and deals you include in the message.

An average marketing or sales department employee at small and mid-size companies sends from 11 to 25 emails daily. And when you have dozens or even hundreds of employees, that's thousands of emails every day, which could be used as powerful branding opportunities that propel your business forward.
And that's why it's hard to argue against the potential of something that can be automatically added to each email without requiring any additional effort from the sender.

We are launching Newoldstamp email signature management software today - https://www.producthunt.com/posts/newoldstamp-2
It helps businesses to create, customize and deploy brand-consistent signatures across the whole company.

Would like to hear your thoughts on this.