The productivity is not the only thing that is being killed, the thing here is that if you are a small business, probably you have an outlook or gmail account, and when you try to reach new costumers by email, your information has a high rate of probability of being confused with SPAM.
Your creativity is then involved not only in the subject of the email but also in the public name of your email address (if you use your personal name and the receiver don't know you, it will be confused as spam)
Be creative or use free services like mailchimp that get whitelisted.