Unlike Exim/Postfix/Sendmail, Qmail is a modular application. It means that each setting is kept in a separate configuration file and each MTA function is performed by a separate binary file from the Qmail pack (qmail-smtp receives the mail, qmail-queue manages the queue, qmail-send sends it further, qmail-rspawn for remote recipients, qmail-lspawn for local recipients, qmail-inject as a sendmail interface and so on). This is because qmail was thought with security concerns in mind, by DJB.

The file where qmail relaying to smarthost settings are kept is named smtproutes and is usually found in /var/qmail/control/

So, in your vi editor, open smtproutes file and add your lines:

Qmail: routing all mails to a smarthost

# echo ":smtp.qmail.com" > /var/qmail/control/smtproutes

(or manually add ":smtp.qmail.com" line (without qutoes) to the file.) this command will set qmail that all your mails will be routed to smtp.qmail.com (will remove other existing lines, so be careful)

Qmail: routing all mails for a specific domain to a smarthost

# echo "domain.com:smtp.qmail.com" >> /var/qmail/control/smtproutes

this command will append a line to your smtproutes instructing qmail to send all mails @domain.com to smtp.qmail.com (rest of the lines will be kept).

If you have qmail-remote-auth patch you can route all emails (or just those for a specific domain) to GMAIL smtp for example:

:smtp.gmail.com gmailuser gmailpassword

(it is enough to provide your gmail username, without @gmail.com)

qmail restart is needed after changes are being done to smtproutes or a HUP signal to qmail-send.

Qmail Flow and Qmail Relaying and EXIM 4 relay to smarthost: How to route all mail except local domain

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