ctladdr

ctladdr=

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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 or through programs (Section 12.2.2):

 ctladdr=<[e-mail]> (111/22), 

The controlling user is printed as an address, the <[e-mail] >, 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.