That’s not accurate. If your email is on your website, of course they can email you. If what you said was true in absolute terms, communication would be impossible.

They can contact you for legitimate reasons, which could be "hey, your website has content from me that is copyrighted" they can't contact you for sales reasons without your consent.

The law for that, at least in my country, is very clear: https://www.ris.bka.gv.at/NormDokument.wxe?Abfrage=Bundesnor...