… the entire form was invalidated because “email must be lower case”…
RFC 2822 says that the local part of an email address (that before the @ sign) may contain:
* Uppercase and lowercase letters (case sensitive)
* The digits 0 through 9
* The characters ! # $ {e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d} & ‘ * + – / = ? ^ _ ` { | } ~
* The character . provided that it is not the first or last character in the local-part.
I’ll have a look at the module but I don’t know what can be done about or, more accurately as you know how good my coding is, I’ll get someone that knows a bit more about coding than me to have a look. 😉
TBH that module’s been there for at least two years and this is the first issue we’ve ever had. 😕