My question involves a consumer law issue in the State(s) of: California & Texas

I live in Californa.

I run my own personal mail server, and have my own email domain name. Have for many years now.

For every vendor I do business with online, I create a unique email address like "comapny.vendor_name@mydomain.com".

I've been doing this for years with companies, banks, hospitals, stores, the government, etc so I can make sure that email back and forth associated with any one vendor is only ever used with, for and by that vendor. And after the inevitable data-breach by some vendor, I can simply disable that one email. Simple, safe, and easy to manage. Never a problem. OVer the years I've got many hundreds of these emails in place.

Now, a Texas-based vendor, after 1st accepting an online order using the vendor-specific email I created for them, has suddenly & weirdly accused me of "committing illegal acts" in violation of "Federal and State laws" by "representing myself as them" and "using their name illegally to make profit" and and that they've "reported me to State and Federal authorities".

This is after one day, one order, and one email. And they actually paid a lawyer to send the threats.

Now that's customer service for ya!

It's of course completely false and they've got absolutely no fact of any kind. They've provided absolutely no specifics of facts, because they can't -- there are none. They've made no mention of specific laws referenced, haven't mentioned patents, or copyrights, or DMCA, etc. It's a complete fabrication clearly based on just their own ignorance.

I replied, told them they're completely wrong on the facts, cancelled my order and told them to lose me forever as a customer -- I sure don't need to do business with insane vendors.

But, for general & future info -- I'm curious as to what specific Federal/Interstate/State laws protect consumers in using their own fully-identified, legitimate domain/email in this vendor-specific way? IANAL, but throwing around false accusations of committing crime with no possible facts or evidence sounds like it's defamation at least, too.