Also, if the F=u delivery agent flag is set, looking up the owner part that follows the ownerin
a mailing list is done in a case-sensitive manner. If the F=u delivery agent flag is clear, the
owner is converted to lowercase before being looked up.
In general, the F=u delivery agent flag should be set in all delivery agent declarations, except
possibly the local delivery agent.
20.8.47 F=U
Use UUCP-style From line All versions
The F=U delivery agent flag causes sendmail to prefix a five-character ???From ??? line to the
start of the headers if there is not already one there. Whether one was prefixed or not, this
delivery agent flag also tells sendmail to add the words remote from host to the end of that
line, and also requires that $g be in the form host!....
The F=U delivery agent flag is required when a neighbor UUCP site runs an old (or possibly
SysV) version of the rmail program. The newer BSD versions of rmail do not require this
delivery agent flag.
Note that the F=n flag (?§20.8.37 on page 776), if specified, overrides this F=U flag.
20.8.48 F=w
Check for valid user identity V8.7 and later
The sendmail program uses the getpwnam(3) routine (and can use others, such as LDAP) to
determine whether a local address corresponds to a local account. If it does, the home
directory for the user is copied into $z (?§21.9.107 on page 852).
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