Don't pass options after the to address to sendmail.  The only
legitiate use of this is to set the sender name which should be
handled specifically by a different option.

Index: usr.bin/mail/main.c
===================================================================
--- usr.bin/mail/main.c.orig
+++ usr.bin/mail/main.c
@@ -171,10 +171,8 @@ main(int argc, char **argv)
 			    errx(1, "Cannot give -f and people to send to");
 		}
 	} else {
-		for (i = optind; (argv[i]) && (*argv[i] != '-'); i++)
+		for (i = optind; argv[i]; i++)
 			to = cat(to, nalloc(argv[i], GTO));
-		for (; argv[i]; i++)
-			smopts = cat(smopts, nalloc(argv[i], 0));
 	}
 	/*
 	 * Check for inconsistent arguments.
@@ -275,8 +273,6 @@ usage(void)
 
 	fprintf(stderr, "usage: %s [-dEIinv] [-b list] [-c list] "
 	    "[-s subject] to-addr ...\n", __progname);
-	fprintf(stderr, "       %*s [-sendmail-options ...]\n",
-	    (int)strlen(__progname), "");
 	fprintf(stderr, "       %s [-dEIiNnv] -f [file]\n", __progname);
 	fprintf(stderr, "       %s [-dEIiNnv] [-u user]\n", __progname);
 	exit(1);
Index: usr.bin/mail/mail.1
===================================================================
--- usr.bin/mail/mail.1.orig
+++ usr.bin/mail/mail.1
@@ -45,7 +45,6 @@
 .Op Fl c Ar list
 .Op Fl s Ar subject
 .Ar to-addr ...
-.Op Fl Ar sendmail-options ...
 .Ek
 .Nm mail
 .Op Fl dEIiNnv