Not WCAG Compliant

[Cardsfan15]

Hello to All.  I received an email saying that the site (store) is not compliant to the "Web Content Accessibility Guidelines (WCAG) and Payment Accessibility Standards". The email address that sent the message is not a Shopify email so I think it is a phishing email.  Do you think that this is legitimate?

[tidetotide]

got same situation from shopifysecureunit@gmail.com, anyone could clarify this?