I can see that having this feature is a great part and can benefit your business needs. As of the moment, the outbox for the covering email for the estimate is unavailable right now.
We are constantly improving our product's features to meet your needs. Everything we have developed within the program rises from hearing to our customers. I'll make sure to let our product developers know about your interest in this feature.
You can check out regularly for product updates and feature enhancements by visiting our blog.
As an alternative, you can use a third-party app that can keep an email.
Feel free to leave a comment below if you have further questions. I'm always here to listen and assist. Have a great day!
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