Patches to qmail-smtpd.
We block invalid users (based on chkuser patch), address blocking lists: badmailfrom, badrcptto, qregex, and other patches depending on what version of Mail::Toaster you are using.
The latest version of Mail::Toaster includes the following patches:
- spf
- chkuser (check for valid local users, syntax)
- spam throttle
- qregex (regular expression matching in badmailfrom and badmailto)
- qmail-tap
There are seperate pages detailing the chkuser and SPF patches.
Qregex
To implement the qregex patches, read the following:
- man qmail-smtpd
- more /var/qmail/doc/README.qregex
Here's a couple good ideas for using qregex:
- 1. block helo hostnames that are not hostnames
- echo "!\." >> /var/qmail/control/badhelo
- 2. force users to fully qualify themselves (i.e. deny "user", accept "user@domain")
- echo "!@" >> /var/qmail/control/badmailfrom
- 3. destination email addresses must not contain invalid characters
- echo "[!%#:*^ {}]" >> /var/qmail/control/badmailto
- echo "@.*@" >> /var/qmail/control/badmailto
Read the man pages for more details.
Spam Throttle:
If you are interested in implementing spam throttle, read the following man pages:
- man qmail-spamthrottle
- man qmail-spamt
- mail qmail-newst
If you just want some reasonable defaults, do this:
- echo "::1501:120000::1000::::" > /var/qmail/control/spamt
- echo "." >> /var/qmail/control/spamt
- /var/qmail/bin/qmail-newst
Qmail-tap
Qmail-tap allows you to archive emails sent through your email system. Read all about qmail-tap on the inter7 web site. To use qmail-tap with Mail::Toaster, you need to manually apply the patch to netqmail and re-install netqmail. There is a customized version of the qmail-tap patch in the contrib directory that will apply cleanly. It's normally as easy as getting into the netqmail build directory (/usr/local/src/mail/netqmail-x.xx/netqmail-x.xx, applying the patch (patch < path/to/qmail-tap.patch), and running "make setup".
| sub-sections |
|---|
| chkuser |
| SPF (Sender Policy Framework) |
Last modified on 5/26/05.