--- sendmail-8.14.4/sendmail/srvrsmtp.c.old	2009-12-18 20:08:01.000000000 +0300
+++ sendmail-8.14.4/sendmail/srvrsmtp.c	2011-02-24 11:24:58.460778349 +0300
@@ -4218,7 +4218,17 @@
 		}
 		else if (sm_strcasecmp(vp, "7bit") == 0)
 		{
-			SevenBitInput = true;
+/*
+ * RFCs 2821 and 5321 describe 3 behaviours for receiver when sender violate RFC and
+ * sending 8bit data via 7bit transport (typical for Microsoft ESMTP MAIL Service):
+ *
+ * 1. clear the high-order bit (behaviour of Sendmail)
+ * 2. reject the message
+ * 3. relay it without inspecting that content (behaviour of Postfix)
+ *
+ * This patch changed behaviour N1 to behaviour N3 (BODY=7BIT always ignored)
+ */
+			SevenBitInput = false;
 		}
 		else
 		{