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Isn't that work email?
Reminds you to choose the correct From address based on the recipient emails addresses.
When first loaded, it will ask you for your work email address and a list of strings to match. When sending a mail matching the patterns, it will remind you if it looks like your sending from your private email address.
For example, stick your clients domain names into the patterns and never again send them an email from your private email address by mistake.
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