..deliverable: mailer $# value, host $@ value, user $: value
The first form is that of pre-V8 sendmail. The second form began with V8.1 sendmail.
The name is the original recipient address after it has undergone aliasing and rule set
rewriting. A local user??™s name expands to the contents of that user??™s ~/.forward file. A
mailing list expands to many names (and produces many lines of output). The mailer, host,
and user correspond to the triple returned by rule set 0 (?§19.5 on page 696). If no $@ is
returned, the host part is omitted from this output.
If the recipient cannot be delivered to, sendmail instead prints the following:
name ...reason
The reason the recipient is undeliverable can be explained by any of many possible error
messages (such as ???No such user???) that would prevent successful delivery.
The -bv switchalso prevents sendmail from collecting any mail message from its standard
input unless the -t command-line switch (?§6.7.44 on page 248) is also given.
Beginning withV8.12, the restrictexpand keyword for the PrivacyOptions option causes
sendmail to drop special privileges when the -bv switch is specified by a user who is neither
root nor a trusted user. This prevents ordinary users from reading ~/.forward files, :include:
files, and private aliases (aliases found in aliases files that are not ordinarily readable).
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