> Qmail was a major offender against SMTP protocol specification for a long time No, it wasn't, ever. It is OK to offer an opinionated view of, e.g., qmail, b

> Qmail was a major offender against SMTP protocol specification for a long time No, it wasn't, ever. It is OK to offer an opinionated view of, e.g., qmail, but please stick to facts. Some people used to argue that qmail's single recipient per envelope was some kind of violation. It never was, still isn't, so please don't repeat flame wars of the 1990's. djbdns didn't provide zone transfers because they were a crappy way to achieve the desired effect and reduced the reliability of the service. Even at the time djbdns was published it was not best practice to enable zone transfers on production servers. No one today uses it for systems that have to be reliable and scalable.