The Bat! 4.0.38 Professional is an email client that's been around for ages. It's a powerful application that's also available as a free Home edition. Sadly the Home edition is rather limited as it doesn't even ship with an inline spell checker, which is essential for writing email. However, the Bat! ships with a whole host of features, including many pre-designed templates which will make your email look rather professional.
The Bat! Professional link.
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