Outlook doesn't validate email addresses correctly. Their validation is a complete failure. Even # isn't allowed in addresses. https://tools.ietf.org/html/rfc53

Outlook doesn't validate email addresses correctly. Their validation is a complete failure. Even # isn't allowed in addresses. https://tools.ietf.org/html/rfc5322#section-3.4 https://tools.ietf.org/html/rfc5322#section-3.4