rewrite: ruleset 96 input: isaac < @ vale (Virtual web hosting)
rewrite: ruleset 96 input: isaac < @ vale . vbrew . com > rewrite: ruleset 96 returns: isaac < @ vale . vbrew . com . > rewrite: ruleset 3 returns: isaac < @ vale . vbrew . com . > rewrite: ruleset 0 input: isaac < @ vale . vbrew . com . > rewrite: ruleset 199 input: isaac < @ vale . vbrew . com . > rewrite: ruleset 199 returns: isaac < @ vale . vbrew . com . > rewrite: ruleset 98 input: isaac < @ vale . vbrew . com . > rewrite: ruleset 98 returns: isaac < @ vale . vbrew . com . > rewrite: ruleset 198 input: isaac < @ vale . vbrew . com . > rewrite: ruleset 198 returns: $# smtp $@ vale . vbrew . com . / $: isaac < @ vale . vbrew . com . > rewrite: ruleset 0 returns: $# smtp $@ vale . vbrew . com . / $: isaac < @ vale . vbrew . com . > We can see that this test has directed the message to the SMTP mailer to be forwarded directly to the vale.vbrew.com host and specifies the user isaac. This test confirms that our LOCAL_NET_CONFIG definition works correctly. For this test to succeed, the destination hostname must be able to be resolved correctly, so it must either have an entry in our /etc/hosts file, or in our local DNS. We can see what happens if the destination hostname isn’t able to be resolved by intentionally specifying an unknown host: # /usr/sbin/sendmail -bt ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter
> 3,0 isaac@vXXXX.vbrew.com rewrite: ruleset 3 input: isaac @ vXXXX . vbrew . com rewrite: ruleset 96 input: isaac < @ vXXXX . vbrew . com > vXXXX.vbrew.com: Name server timeout rewrite: ruleset 96 returns: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 3 returns: isaac < @ vXXXX . vbrew . com > == Ruleset 3,0 (3) status 75 rewrite: ruleset 0 input: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 199 input: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 199 returns: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 98 input: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 98 returns: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 198 input: isaac < @ vXXXX . vbrew . com > rewrite: ruleset 95 input: < uucp-new : moria > isaac rewrite: ruleset 95 returns: $# uucp-new $@ moria $: isaac rewrite: ruleset 198 returns: $# uucp-new $@ moria $: isaac rewrite: ruleset 0 returns: $# uucp-new $@ moria $: isaac This result is very different. First, ruleset 3 returned an error message indicating the hostname could not be resolved. Second, we deal with this situation by relying on the other key feature of our configuration, the smart host. The smart host will is to handle any mail that is otherwise undeliverable. The hostname we specified in this test was unable to be resolved and the rulesets determined that the mail should be forwarded to our smart host moria using the uucp-new mailer. Our smart host might be better connected and know what to do with the address. Our final test ensures that any mail addressed to a host not within our domain is delivered to our smart host. This should produce a result similar to our previous example: # /usr/sbin/sendmail -bt ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter
> 3,0 isaac@linux.org.au rewrite: ruleset 3 input: isaac @ linux . org . au rewrite: ruleset 96 input: isaac < @ linux . org . au > rewrite: ruleset 96 returns: isaac < @ linux . org . au . > rewrite: ruleset 3 returns: isaac < @ linux . org . au . > rewrite: ruleset 0 input: isaac < @ linux . org . au . > rewrite: ruleset 199 input: isaac < @ linux . org . au . >