I believe putting the following in /var/qmail/control/smtproutes should
do the magic.
:your.isp.relay.server
>From man qmail-remote
<--------
smtproutes
Artificial SMTP routes. Each route has the form
domain:relay, without any extra spaces. If domain
matches host, qmail-remote will connect to relay, as
if host had relay as its only MX. (It will also
avoid doing any CNAME lookups on recip.) host may
include a colon and a port number to use instead of
the normal SMTP port, 25:
inside.af.mil:firewall.af.mil:26
relay may be empty; this tells qmail-remote to look
up MX records as usual. smtproutes may include wild
cards:
.af.mil:
:heaven.af.mil
Here any address ending with .af.mil (but not af.mil
itself) is routed by its MX records; any other
address is artificially routed to heaven.af.mil.
The qmail system does not protect you if you create
an artificial mail loop between machines. However,
you are always safe using smtproutes if you do not
accept mail from the network.
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