When you move /usr/sbin/sendmail to *.bak, you are taking the actual
original "sendmail" program out of action. But you may have many other
perl/... scripts as well as shell users that have the sendmail command
embedded in them. So the best way to accommodate them in your move to a
qmail system is to provide a wrapper called sendmail that dumps their
stuff into the qmail system (using qmail-inject??? dunno still a qmail
newbie). So you make those symbolic links so that if some script or user
calls sendmail or /usr/sbin/sendmail or /usr/lib/sendmail, they in
reality call the qmail wrapper.

Anand Saokar wrote:

> The document for Installing QMail and REMOVING Sendmail stated that:
> 15. Make qmail's ``sendmail'' wrapper available to MUAs:
>        # ln -s /var/qmail/bin/sendmail /usr/lib/sendmail
>        # ln -s /var/qmail/bin/sendmail /usr/sbin/sendmail
>
> but before this step /usr/sbin/sendmail is moved as
> /usr/sbin/sendmail.bak !!! So, what is the use of linking qmail's
> sendmail with actual non-existing sendmail executable?
>
> Reply asap,
> n'x,
> Anand
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