... User unknown Jun 9 15:25:48 host sm-..."/>

Sendmail config question

I get quite a few of these "scans" every day. Many of them are MUCH longer:
Code: 
Jun  9 15:25:47 host sm-mta[16617]: i59MPkWx016617: <crawford@xx***********>... User unknown
Jun  9 15:25:48 host sm-mta[16617]: i59MPkWx016617: <conner@xx***********>... User unknown
Jun  9 15:25:48 host sm-mta[16617]: i59MPkWx016617: <craig@xx***********>... User unknown
Jun  9 15:25:49 host sm-mta[16617]: i59MPkWx016617: <cohen@xx***********>... User unknown
Jun  9 15:25:50 host sm-mta[16617]: i59MPkWx016617: <cole@xx***********>... User unknown
Jun  9 15:25:50 host sm-mta[16617]: i59MPkWx016617: <chapman@xx***********>... User unknown
Jun  9 15:25:51 host sm-mta[16617]: i59MPkWx016617: from=<Xbddin@mailexite.com>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=c-66-41-99-68.mn.client2.attbi.com [66.41.99.68]
Jun  9 15:25:52 host sm-mta[16617]: i59MPkX0016617: <cobb@xx***********>... User unknown
Jun  9 15:25:52 host sm-mta[16617]: i59MPkX0016617: <chavez@xx***********>... User unknown
Jun  9 15:25:52 host sm-mta[16617]: i59MPkX0016617: <castro@xx***********>... User unknown
Jun  9 15:25:53 host sm-mta[16617]: i59MPkX0016617: <chandler@xx***********>... User unknown
Jun  9 15:25:53 host sm-mta[16617]: i59MPkX0016617: <carlson@xx***********>... User unknown
Jun  9 15:25:53 host sm-mta[16617]: i59MPkX0016617: <carroll@xx***********>... User unknown
Jun  9 15:25:54 host sm-mta[16617]: i59MPkX0016617: <chambers@xx***********>... User unknown
Jun  9 15:25:54 host sm-mta[16617]: i59MPkX0016617: <carr@xx***********>... User unknown
Jun  9 15:25:55 host sm-mta[16617]: i59MPkX0016617: <carpenter@xx***********>... User unknown
Jun  9 15:25:55 host sm-mta[16617]: i59MPkX0016617: from=<mmibnlpuu@netzero.net>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=c-66-41-99-68.mn.client2.attbi.com [66.41.99.68]
Jun  9 15:25:57 host sm-mta[16617]: i59MPkX1016617: <castillo@xx***********>... User unknown
Jun  9 15:25:57 host sm-mta[16617]: i59MPkX1016617: <caldwell@xx***********>... User unknown
Jun  9 15:25:58 host sm-mta[16617]: i59MPkX1016617: <burgess@xx***********>... User unknown
Jun  9 15:25:59 host sm-mta[16617]: i59MPkX1016617: from=<Ofogm@midcoast.com>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA, relay=c-66-41-99-68.mn.client2.attbi.com [66.41.99.68]
Does anyone know of a way to configure sendmail so that it closes the connection after X amount of "User unknown" messages?

 

 

 

 

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