com were looked up, the following might be returned:
mail11 . disney . com . , mail . disney . com .
If the -z switch wrongly specifies a character that can exist in a domain name (such as a
dot), the following error will be reported and only one MX record will be returned:
bestmx_map_lookup: MX host mail11.disney.com. includes map delimiter character 0x2E
If too many MX records are returned, the list can be truncated to avoid an overly long
workspace. When the list is truncated, some MX records can be lost. This can become a
serious problem when this -z switch is used with this database-map type and when
FEATURE(relay_based_on_MX) is also declared (?§7.4.4 on page 271).
This type can be watched with the -d8 debugging switch (?§15.7.12 on page 548).
23.7.4 dbm
Really ndbm supplied with most versions of Unix V8.1 and later
The dbm database-map type, which is really the ndbm form of database, is the traditional
form of Unix database file. Data is stored in one file, keys in another. The data must fit in
blocks of fixed sizes, so there is usually a limit on the maximum size (1 kilobyte or so) on
any given stored piece of data. The dbm database-map type is available only if sendmail was
compiled with NDBM declared (?§3.4.30 on page 125).
Many database switches are available with this dbm database-map type. All are listed in
Table 23-9.
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