> | Solaris uses "Reply-To:" to replace just "From:" > | (although it has "R" and "r" the wrong way round!) > > The original BSD "Mail" did it that way, I have no idea when they > swapped cases, that is 'r' was a "small" reply, and "R" a "big" reply... > > But almost everyone uses "big" replies all the time, replying only to > the author is a less common thing to do, and R is harder to type than r, > so I guess somewhere along the way, someone switched them. >
This is controlled by the POSIX-standard mailx variable "flipr". It can be set system-wide (/etc/mail.rc) or per-user ($HOME/.mailrc). Some of the history can be found in the POSIX rationale: "The meanings of r and R are reversed between System V mailx and SunOS Mail. Once again, since this volume of POSIX.1-2017 chose the mailx name, it kept the System V default, but allows the SunOS user to achieve the desired results using flipr, an internal variable in System V mailx, although it has not been documented in the SVID." - Mark
