On Tue, Apr 01, 2025 at 10:43:57AM -0500, Tim Chase wrote: > While the man-page does document using "~|" when editing a message to > pipe it through a command, mail(1) also supports the "pipe" command > (also known as "|") as registered in "cmdtab.c" line 63-64 and it works > fine, but the man-page lacks documentation for this command (which I > would expect to see between the help for "next" and "Preserve").
It's documented in the 'Recipient address specifications' section: An address that starts with a pipe (‘|’) character is treated as a command to run. The command immediately following the ‘|’ is executed with the message as its standard input.
