sendmail, 4th Edition

$Y

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The UUCP relay for unclassified hosts

mc configuration

$Y holds as its value the name of the host that will handle all UUCP mail that was not otherwise handled by class $=V , $=W , or $=X . See Section 4.6.6 for a discussion of UUCP relays in general, and how this macro relates to $V , $W , and $X macros.