Index: usersmtp.c
===================================================================
RCS file: /cvs/sendmail/usersmtp.c,v
retrieving revision 8.482
diff -u -r8.482 usersmtp.c
--- usersmtp.c	3 Feb 2010 18:39:55 -0000	8.482
+++ usersmtp.c	10 Mar 2010 04:29:04 -0000
@@ -476,7 +476,8 @@
 #if SASL
 	else if (sm_strcasecmp(line, "auth") == 0)
 	{
-		if (p != NULL && *p != '\0')
+		if (p != NULL && *p != '\0' &&
+		    !bitset(MCIF_AUTH2, mci->mci_flags))
 		{
 			if (mci->mci_saslcap != NULL)
 			{
@@ -488,7 +489,7 @@
 
 				mci->mci_saslcap = str_union(mci->mci_saslcap,
 							     p, mci->mci_rpool);
-				mci->mci_flags |= MCIF_AUTH;
+				mci->mci_flags |= MCIF_AUTH2;
 			}
 			else
 			{
@@ -505,6 +506,9 @@
 				}
 			}
 		}
+		if (tTd(95, 5))
+			sm_syslog(LOG_DEBUG, NOQID, "AUTH flags=%lx, mechs=%s",
+				mci->mci_flags, mci->mci_saslcap);
 	}
 #endif /* SASL */
 }
Index: sendmail.h
===================================================================
RCS file: /cvs/sendmail/sendmail.h,v
retrieving revision 8.1077
diff -u -r8.1077 sendmail.h
--- sendmail.h	2 Feb 2010 18:05:23 -0000	8.1077
+++ sendmail.h	10 Mar 2010 04:29:04 -0000
@@ -803,6 +803,7 @@
 # define MCIF_HELO	0x00800000	/* we used HELO: ignore extensions */
 #endif /* _FFR_IGNORE_EXT_ON_HELO */
 #define MCIF_INLONGLINE 0x01000000	/* in the middle of a long line */
+#define MCIF_AUTH2	0x02000000	/* got 2 AUTH lines */
 #define MCIF_ONLY_EHLO	0x10000000	/* use only EHLO in smtpinit */
 
 /* states */
Index: mci.c
===================================================================
RCS file: /cvs/sendmail/mci.c,v
retrieving revision 8.222
diff -u -r8.222 mci.c
--- mci.c	6 Jan 2010 01:33:11 -0000	8.222
+++ mci.c	10 Mar 2010 04:29:04 -0000
@@ -593,6 +593,7 @@
 	{ MCIF_CVT7TO8,		"CVT7TO8"	},
 	{ MCIF_INMIME,		"INMIME"	},
 	{ MCIF_AUTH,		"AUTH"		},
+	{ MCIF_AUTH2,		"AUTH2"		},
 	{ MCIF_AUTHACT,		"AUTHACT"	},
 	{ MCIF_ENHSTAT,		"ENHSTAT"	},
 	{ MCIF_PIPELINED,	"PIPELINED"	},