Our resident sendmail guru has figured out how to handle LISTSERV probe
bounces without patching the sendmail binary. Sendmail must be compiled
with the "-DMAP_REGEX" option. This has been tested with both sendmail
8.9.3 and sendmail 8.10.2. Appended below are the relevant lines from
our listserv.mc file. All of the usual caveats apply.

--- begin listserv.mc ---
LOCAL_CONFIG
Klowner regex -s2 ^(.*)(owner-.+)\*.*\*\*.+$

LOCAL_RULE_0
R$+ < @ $=w . >          $: $(lowner $1 $: $1 $) < @ $2 . >
--- end listserv.mc ---

--
Paul Russell
Senior Systems Administrator
University of Notre Dame
http://www.nd.edu/~prussell