h file.
The /map rule-testing command is very useful for testing databases of your own
design. If a rule that uses the database fails to work as predicted, use /map to test that
database by hand. To illustrate, consider the sampling of maps in the following
sections.
8.5.3.1 The aliases database map
The aliases map is used to convert a local address into one or more new addresses.
Using the rule-testing /map command, you can see how sendmail looks up an alias:
> /map aliases root
map_lookup: aliases (root) returns you, hans@other.site (0)
8.5.3.2 The host map
The host database behaves the same as the /canon command shown earlier. It looks
up a hostname by using sendmail??™s internal host map (?§23.4.3 on page 895) which
returns the canonical name of the looked-up host:
This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
8.5 Complex Actions Made Simple | 311
> /map host localhost
map_lookup: host (localhost) returns localhost.our.domain. (0)
> /map host bogus.no.domain
map_lookup: host (bogus.no.domain) no match (68)
8.5.3.3 The dequote map
The dequote map (?§23.7.5 on page 904) is not really a database at all, but a hook into
a routine that removes quotation marks from addresses:
> /map dequote "a"@"@b"
map_lookup: dequote ("a"@"@b") returns a@@b (0)
> /map dequote "a
map_lookup: dequote ("a) no match (0)
> /map dequote "
map_lookup: dequote ("> /map dequote "(a"
map_lookup: dequote ("(a") no match (0)
Note in the second example that it removes only balanced quotation marks.
Pages:
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571