Hi,
Facing an incredible blitz from spammers I decided to add the dnsbl feature in sendmail.mc (debproto.mc,v 8.14.4) as:
FEATURE(`dnsbl',`sbl-xbl.spamhaus.org')dnl
after compiling I see that it appears in sendmail.cf
# DNS based IP address spam list sbl-xbl.spamhaus.org
R$* $...
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