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The ifaddr program

Interface

where field is an 822-format header field and addr is an email address. If no field arguments appear, then ifaddr uses To and Cc.

ifaddr reads a message from standard input, exiting 0 if any addr appears in a field header, and exiting 100 if there is no match. Invoked with no addr arguments, ifaddr looks for the address in the environment variable $RECIPIENT. Address comparisons are case insensitive.

If it encounters a temporary error while reading input, ifaddr exits 111.

If an address begins with @, then ifaddr compares it to the domain portion of addresses from each relevant field.

For example, the .qmail line

writes correspondence with myfriend to dir.

The invocation

writes a message with a To or Cc address in the domain example.com to dir.