09-10-2008
That's what it sounds like to me. Or rather, the email probably doesn't want to talk about reverse DNS at all (and if I were them I would not want to talk about it :-)
Some places set up indirections so they can delegate subspaces of a reverse DNS range but if they don't offer you this service up front, they probably don't have it set up that way.
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LEARN ABOUT DEBIAN
inetutils-talk
TALK(1) BSD General Commands Manual TALK(1)
NAME
talk -- talk to another user
SYNOPSIS
talk person [ttyname]
DESCRIPTION
Talk is a visual communication program which copies lines from your terminal to that of another user.
Options available:
person If you wish to talk to someone on your own machine, then person is just the person's login name. If you wish to talk to a user on
another host, then person is of the form 'user@host'.
ttyname If you wish to talk to a user who is logged in more than once, the ttyname argument may be used to indicate the appropriate terminal
name, where ttyname is of the form 'ttyXX'.
When first called, talk sends the message
Message from TalkDaemon@his_machine...
talk: connection requested by your_name@your_machine.
talk: respond with: talk your_name@your_machine
to the user you wish to talk to. At this point, the recipient of the message should reply by typing
talk your_name@your_machine
It doesn't matter from which machine the recipient replies, as long as his login-name is the same. Once communication is established, the
two parties may type simultaneously, with their output appearing in separate windows. Typing control-L '^L' will cause the screen to be
reprinted, while your erase, kill, and word kill characters will behave normally. To exit, just type your interrupt character; talk then
moves the cursor to the bottom of the screen and restores the terminal to its previous state.
Permission to talk may be denied or granted by use of the mesg(1) command. At the outset talking is allowed. Certain commands, in particu-
lar nroff(1) and pr(1), disallow messages in order to prevent messy output.
FILES
/etc/hosts to find the recipient's machine
/var/run/utmp to find the recipient's tty
SEE ALSO
mail(1), mesg(1), who(1), write(1)
BUGS
The version of talk(1) released with 4.3BSD uses a protocol that is incompatible with the protocol used in the version released with 4.2BSD.
HISTORY
The talk command appeared in 4.2BSD.
4.2 Berkeley Distribution June 6, 1993 4.2 Berkeley Distribution