diff --git a/contrib/sendmail/src/mci.c b/contrib/sendmail/src/mci.c
index 4955197a6ebb..4ff75780bfbc 100644
--- a/contrib/sendmail/src/mci.c
+++ b/contrib/sendmail/src/mci.c
@@ -398,6 +398,57 @@ mci_get(host, m)
 
 	return mci;
 }
+
+/*
+**  MCI_CLOSE -- (forcefully) close files used for a connection.
+**	Note: this is a last resort, usually smtpquit() or endmailer()
+**		should be used to close a connection.
+**
+**	Parameters:
+**		mci -- the connection to close.
+**		where -- where has this been called?
+**
+**	Returns:
+**		none.
+*/
+
+void
+mci_close(mci, where)
+	MCI *mci;
+	char *where;
+{
+	bool dumped;
+
+	if (mci == NULL)
+		return;
+	dumped = false;
+	if (mci->mci_out != NULL)
+	{
+		if (tTd(56, 1))
+		{
+			sm_dprintf("mci_close: mci_out!=NULL, where=%s\n",
+				where);
+			mci_dump(sm_debug_file(), mci, false);
+			dumped = true;
+		}
+		(void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT);
+		mci->mci_out = NULL;
+	}
+	if (mci->mci_in != NULL)
+	{
+		if (tTd(56, 1))
+		{
+			sm_dprintf("mci_close: mci_in!=NULL, where=%s\n",
+				where);
+			if (!dumped)
+				mci_dump(sm_debug_file(), mci, false);
+		}
+		(void) sm_io_close(mci->mci_in, SM_TIME_DEFAULT);
+		mci->mci_in = NULL;
+	}
+	mci->mci_state = MCIS_CLOSED;
+}
+
 /*
 **  MCI_NEW -- allocate new MCI structure
 **
diff --git a/contrib/sendmail/src/sendmail.h b/contrib/sendmail/src/sendmail.h
index 673cee5cf073..370fae856b89 100644
--- a/contrib/sendmail/src/sendmail.h
+++ b/contrib/sendmail/src/sendmail.h
@@ -728,6 +728,7 @@ MCI
 
 /* functions */
 extern void	mci_cache __P((MCI *));
+extern void	mci_close __P((MCI *, char *where));
 extern void	mci_dump __P((SM_FILE_T *, MCI *, bool));
 extern void	mci_dump_all __P((SM_FILE_T *, bool));
 extern void	mci_flush __P((bool, MCI *));
diff --git a/contrib/sendmail/src/usersmtp.c b/contrib/sendmail/src/usersmtp.c
index 0bcbcf51bbf1..24b09549a12a 100644
--- a/contrib/sendmail/src/usersmtp.c
+++ b/contrib/sendmail/src/usersmtp.c
@@ -89,6 +89,7 @@ smtpinit(m, mci, e, onlyhelo)
 	*/
 
 	SmtpError[0] = '\0';
+	SmtpMsgBuffer[0] = '\0';
 	CurHostName = mci->mci_host;		/* XXX UGLY XXX */
 	if (CurHostName == NULL)
 		CurHostName = MyHostName;
@@ -2899,7 +2900,10 @@ smtpquit(m, mci, e)
 	char *oldcurhost;
 
 	if (mci->mci_state == MCIS_CLOSED)
+	{
+		mci_close(mci, "smtpquit:1");
 		return;
+	}
 
 	oldcurhost = CurHostName;
 	CurHostName = mci->mci_host;		/* XXX UGLY XXX */
@@ -3133,7 +3137,7 @@ reply(m, mci, e, timeout, pfunc, enhstat, rtype)
 			if (strncmp(SmtpMsgBuffer, "QUIT", 4) == 0)
 			{
 				errno = mci->mci_errno;
-				mci->mci_state = MCIS_CLOSED;
+				mci_close(mci, "reply:1");
 				return -1;
 			}
 			mci->mci_state = MCIS_ERROR;
@@ -3158,7 +3162,7 @@ reply(m, mci, e, timeout, pfunc, enhstat, rtype)
 			/* errors on QUIT should be ignored */
 			if (strncmp(SmtpMsgBuffer, "QUIT", 4) == 0)
 			{
-				mci->mci_state = MCIS_CLOSED;
+				mci_close(mci, "reply:2");
 				return -1;
 			}