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Rule Sets
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29.11 Pitfalls

  • Rules that hide hosts in a domain should be applied only to sender addresses. Avoid the temptation to place such substitutions of host for domain names into rule set 3. Rule set 3 applies to all addresses and can wrongly change a nonlocal address.

  • Not all configuration files focus with user<@domain> . IDA, for example, uses a more complex focus: <@domain>,...,user . Be sure you understand the style of focusing that is used in your configuration file before attempting to create new rules.

  • Avoid confusing rule sets 1 and 2 when adding rules. Rule set 1 is for the sender; rule set 2 is for the recipient.

  • Typos in rule-set declarations can be difficult to locate. For example, S1O (in which the last character is the capital letter O) will silently evaluate to rule set 1 when you really meant rule set 10.

  • All versions of sendmail except V8 wrongly call rule set 2 and the recipient R= when processing the envelope sender.

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