Anbei das Log hierzu:
#Software: Microsoft Exchange Server 2010
#Version: 14.0.0.0
#Log-type: SMTP Send Protocol Log
#Date: 2012-03-15T11:43:31.633Z
#Fields: date-time,connector-id,session-id,sequence-number,local-endpoint,remote-endpoint,event,data,context
2012-03-15T11:43:31.633Z,Internet Mail Versand,08CED0A9722EDDB1,0,,[iP SMTP Server]:25,*,,attempting to connect
2012-03-15T11:43:31.668Z,Internet Mail Versand,08CED0A9722EDDB1,1,[iP Exchange Server]:43469,:25,+,,
2012-03-15T11:43:31.699Z,Internet Mail Versand,08CED0A9722EDDB1,2,[iP Exchange Server]:43469,[iP SMTP Server]:25,<,476 connections from your host are denied,
2012-03-15T11:43:31.701Z,Internet Mail Versand,08CED0A9722EDDB1,3,[iP Exchange Server]:43469,[iP SMTP Server]:25,>,QUIT,
2012-03-15T11:43:31.703Z,Internet Mail Versand,08CED0A9722EDDB1,4,[iP Exchange Server]:43469,[iP SMTP Server]:25,-,,Remote
2012-03-15T11:53:31.699Z,Internet Mail Versand,08CED0A9722EDDB2,0,,[iP SMTP Server]:25,*,,attempting to connect
2012-03-15T11:53:31.732Z,Internet Mail Versand,08CED0A9722EDDB2,1,[iP Exchange Server]:57079,[iP SMTP Server]:25,+,,
2012-03-15T11:53:31.762Z,Internet Mail Versand,08CED0A9722EDDB2,2,[iP Exchange Server]:57079,[iP SMTP Server]:25,<,476 connections from your host are denied,
2012-03-15T11:53:31.765Z,Internet Mail Versand,08CED0A9722EDDB2,3,[iP Exchange Server]:57079,[iP SMTP Server]:25,>,QUIT,
2012-03-15T11:53:31.779Z,Internet Mail Versand,08CED0A9722EDDB2,4,[iP Exchange Server]:57079,[iP SMTP Server]:25,-,,Remote
2012-03-15T12:03:31.756Z,Internet Mail Versand,08CED0A9722EDDBF,0,,[iP SMTP Server]:25,*,,attempting to connect
2012-03-15T12:03:31.790Z,Internet Mail Versand,08CED0A9722EDDBF,1,[iP Exchange Server]:57105,[iP SMTP Server]:25,+,,
2012-03-15T12:03:31.820Z,Internet Mail Versand,08CED0A9722EDDBF,2,[iP Exchange Server]:57105,[iP SMTP Server]:25,<,476 connections from your host are denied,
2012-03-15T12:03:31.822Z,Internet Mail Versand,08CED0A9722EDDBF,3,[iP Exchange Server]:57105,[iP SMTP Server]:25,>,QUIT,
2012-03-15T12:03:31.824Z,Internet Mail Versand,08CED0A9722EDDBF,4,[iP Exchange Server]:57105,[iP SMTP Server]:25,-,,Remote