Many regular expressions that must be case insensitive are currently case sensitive. Importantly rfc5321.mail, e.g. proxy localhost:1438 rejected "MAIL From:paul@armstrongdumontet.ca SIZE=2053": "555 5.5.4 MAIL FROM/RCPT TO parameters not recognized or not implemented"
Many regular expressions that must be case insensitive are currently case sensitive. Importantly rfc5321.mail, e.g. proxy localhost:1438 rejected "MAIL From:paul@armstrongdumontet.ca SIZE=2053": "555 5.5.4 MAIL FROM/RCPT TO parameters not recognized or not implemented"