Bug#805451: Bugs/Reporting: please document for each pseudo-header in which [email protected] it can be used

Kind of related: I find the "Mail servers' reference card"
at https://www.debian.org/Bugs/server-refcard not helpful at
all.  I expect a reference card to briefly describe each
command that is used in day-to-day operations; instead, the
Debian Bugs one just lists (all?) commands and their synop-
sis, but /not/ what they do, neither does the list of "bug
submission and followup addresses".

I find myself constantly cycling through three or four pages
on debian.org and browsing through source code to (in the
end) /guess/ what I need to do to achieve something.