When you build a configuration table, you can do a certain amount of
testing using the test mode of
sendmail(1M).
For example, you could invoke sendmail as:
sendmail -bt -Ctest.cf
This would read the configuration file test.cf and enter test
mode. In this mode, you enter lines of the form:
rwset address
rwset is the rewriting set you want to use and address
is an address to apply the set to. Test mode shows you the steps it takes
as it proceeds, finally showing you the address it ends up with. You may
use a comma separated list of rwsets for sequential application
of rules to an input. For example:
3,1,21,4 monet:bollard
This first applies ruleset three to the input monet:bollard. Ruleset one is then applied to the output of ruleset three, followed similarly by rulesets twenty-one and four.
If you need more detail, you can also use the -d21 flag to turn
on more debugging. For example:
sendmail -bt -d21.99
This turns on an incredible amount of information; a single word address is probably going to print out several pages worth of information.
You should be warned that internally, sendmail applies ruleset
3 to all addresses. In test mode you will have to do that manually. For
example, older versions allowed you to use
0 bruce@broadcast.sony.com
This version requires that you use:
3,0 bruce@broadcast.sony.com
As of version 8.7, some other syntaxes are available in test mode: