There are laws against sending spam. There are even laws that you must follow when you send
email that was requested. In order to be in compliance with the anti-spam laws in various states in the US, each commercial email that you send must include your name or business name, your street address, city, state, zip code, and phone number.
You must also include instructions that will allow the recipient to remove themselves from your mailing list or your newsletter. Protect yourself from spam complaints in any way that you can. Make sure that when a customer requests any type of information from you that an
email is sent requesting confirmation before any other email is sent.
If someone is placing an order from you, include a check box on the order form, asking for permission to send them periodic emails. Never use your autoresponder to send unsolicited commercial email!
Those are pretty simple rules that you should obey. When someone thinks that you are sending them spam, your business might be over. So don’t underestimate.