Improve e-mail validity check by requiring surrounding characters

index.js

@@ -8,11 +8,13 @@ let commonErrors = [
 	/^.+<[^>]+>$/, // Real Name <email@example.com>
 ];
 
+let validEmail = /.@./; // Contains an @, and is preceded and succeeded by at least one character
+
 module.exports = [
 	isString,
 	function isEmailAddress(value) {
 		// TODO: Include explanation in README as to how checking for the presence of '@' really *is* the correct check in practice, and that any further validation should be done by actually trying to send an e-mail
-		if (!value.includes("@") || commonErrors.some((errorRegex) => errorRegex.test(value))) {
+		if (!validEmail.test(value) || commonErrors.some((errorRegex) => errorRegex.test(value))) {
 			throw new ValidationError(`Must be an e-mail address`);
 		}
 	}