Is ereplacementparts.com Safe?

I ordered two obscure parts for an ancient tool from this company. My order was filled/delivered within 2 days... from Utah! I haven't seen any odd spam yet.

When I ordered from this company, I gave them a custom email address. Since I own my own domain names, I was able to give them a custom email address in the format ***** (using my actual domain name) so they were the ONLY company that had access to that email address. I never used it to send email, only to receive it from them. So when I started getting spam from people unrelated to them, I knew that either they gave away/sold my personal information, or more likely, lack sufficient security on their system to prevent people from harvesting my personal information. Either one of their employees sold my information to spammers, an internal computer at their company had a virus or trojan, their web server had a security issue, or for some other reason they were not able to keep my information private. If my email address can get to spammers, I have no idea what other information of mine is not safe. Either their site lacks sufficient security to keep your data private, or even worse they are intentionally compromising your information.