ctladdr=
The controlling user syslog equate
When sendmail logs the recipient’s record, it will include the identity of the controlling user, if there is one. A controlling user is set when delivering to files (Delivery to Files on page 466) or through programs (Delivery Via Programs on page 468):
ctladdr=<you@your.domain> (111/22),
The controlling user is printed as an address, the
<you@your.domain>, although it
could also be a local login name when mail
originates locally (such as you). If the controlling user is the
identity of a local user, the
uid (the 111) and the
gid (the 22) for that user
are also logged.
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