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sendmail-devel. On Debian the package is libmilter-dev.
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You should already have clamd configured and running according to the instructions in the Installing ClamAV section. You want it to be creating a local socket, which is the first method of setting it up that was described in that section. Now you need to start the
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clamav-milter function running. You can run the daemon from the command line; it comes with a number of options. Table 7-12 details some of those options. Table 7-12. clamav-milter Command-Line Options
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-b -D -l -o --quiet --max-children=x
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Sends a failure message to the sender (not recommended) Prints debug messages Controls scanning of messages sent from local network Controls scanning of outgoing messages Does not send e-mail notifications of virus detection Restricts the maximum number of processes spawned to filter e-mail
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Most of these options are pretty much self-explanatory, but several deserve a special mention. The -b option is often turned on in clamav-milter configurations. These days this is not a good idea. This is for two reasons. First, more often than not the sender address on a virus infected e-mail is unlikely to be the person who actually sent it. Second, if you are under a serious virus attack, you could create serious performance issues for your MTA by trying to process thousands of outgoing bounce messages in addition to the incoming mail. So do not bother to bounce messages. The other option, --quiet, stops clamav-milter from sending an e-mail notification of the virus detection to the sender of the e-mail. For the previous reasons this is a good option to have on. Listing 7-48 shows the command line you can use to start clamav-milter. Listing 7-48. Starting clamav-milter from the Command Line puppy# /usr/local/sbin/clamav-milter -ol --quiet - -max-children=20 local:/var/run/clamav/clamav-milter.sock local:/var/run/clamav/clamav-milter.sock defines the socket milter will use to communicate with the clamd daemon; you need to specify this to Sendmail in the next section. I have put the socket in the same directory as the clamd socket specified in the previous section. You should automate the start of your clamav-milter daemon when your system starts make sure it is before you start Sendmail. In the clamav-milter directory in the ClamAV source distribution, an init script is available for clamav-milter that you can customize. Now you need to tell Sendmail about clamav-milter. Add these two lines to your sendmail.mc file to define clamav-milter as a filter: INPUT_MAIL_FILTER(`clamav', `S=local:/var/run/clamav/clamav-milter.sock, F=, T=S:4m;R:4m') define(`confINPUT_MAIL_FILTERS', `clamav') This will define an input mail filter for all incoming mail that will send that mail to the socket clamav-milter has created. The delivery agent F= option in the first line tells Sendmail how you would like it to handle the milter being unavailable. You can make a few possible choices about how Sendmail should handle it if the milter is unavailable. By leaving F= blank you are specifying mail should keep flowing even if the milter is unavailable. This is potentially a very bad idea, because if your clamav-milter breaks, then virus-infected e-mail will
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simply pass straight through Sendmail. You could also set it to F=T, which would temporarily reject the message. Or you could even set it to F=R, which would reject the message as undeliverable. I recommend you read about the delivery agent options before making a definitive choice as to your response. The T= options are all timeouts. For most systems, these defaults should be fine. Now if you rebuild sendmail.cf and restart Sendmail, all your mail will now be filtered through ClamAV. If you initially set the -D option in clamav-milter, you should be able to track the submission and scanning of all your e-mail via milter and ClamAV in your mail logs.
s If you do not want to integrate ClamAV and Sendmail using milter, you could also look at AMaVis Tip
(http://www.amavis.org/) or MailScanner. You could also do filtering during the local delivery process using procmail or maildrop, but I recommend that the earlier you address any virus and spam filtering in the mail process is best.
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