This is an easy one:
(compat/sendmail/sendmail.c, around line 375)
(wdiff format -- that's wisner diff)
if (!binary) {
! for (; optind < argc; ++optind) {
+ cp = strchr(argv[optind], '\0');
+ if (*--cp == ',')
+ *cp = '\0';
! (void) fprintf(mfp, "to %s\n", argv[optind]);
! }
}