Re: Quick email related question - should my store email address match my domain name
The best practice if you are accepting payments of any kind is to have the return/reply email address the same as the domain. If you don't you run the risk of chargebacks, because customers are apt to think the shop could be a scam. The business name that shows on the customer's credit card statement should match the domain too.
Please do not PM for support issues: a private solution doesn't benefit the community.
Be careful with unsolicited advice via email or PM - Make sure the person you are talking to is a reliable source.