??? If th eAliasFile option is omitted and if there is no service-switch file or if there
is a service-switchfile but it omits an aliases line, sendmail silently presumes
that it should not do aliasing.
Note that service-switch files and the AliasFile option can list other techniques for
obtaining aliases in addition to, or instead of, an aliases(5) file. But this can lead to a
side effect. For example, if your configuration file declares:
O AliasFile=/etc/aliases,nis:
and if the service-switch file aliases line specifies:
aliases nis files
sendmail looks up aliases first with nis, then in the /etc/aliases file, then with nis a second
time.
12.1.2 Local Must Be Local
The local part of an alias must be in the form of a local recipient.* This restriction is
enforced eachtime sendmail reads the aliases(5) file. For every name to the left of a
colon that it finds, sendmail performs the following normalization and verification
steps.
To begin, sendmail normalizes each address by removing everything but the address
part. For example, consider the following two alias lines:
george (George Washington): gw
George Washington
: gw
When sendmail reads these lines, it normalizes each into its address part:
george (George Washington) becomes ?†’ george
George Washington becomes ?†’ george
Afterward, the address part is extracted and rewritten by the canonify rule set 3 and
the parse rule set 0, to see whether it causes any delivery agent with the F=A flag set
(?§20.
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