5166 sendmail package should be replaceable

*** 36,47 ****
   * University Acknowledgment- Portions of this document are derived from
   * software developed by the University of California, Berkeley, and its
   * contributors.
   */
  
- #pragma ident   "%Z%%M% %I%     %E% SMI"
- 
  /*
   * mailx -- a modified version of a University of California at Berkeley
   *      mail program
   *
   * Handle name lists.
--- 36,45 ----
*** 605,644 ****
  
          extra = 2;
  
          if (rflag != NOSTR)
                  extra += 2;
- #ifdef SENDMAIL
          extra++;
          metoo = value("metoo") != NOSTR;
          if (metoo)
                  extra++;
          verbose = value("verbose") != NOSTR;
          if (verbose)
                  extra++;
          if (hflag)
                  extra += 2;
- #endif /* SENDMAIL */
          top = (char **) salloc((t + extra) * sizeof (char *));
          ap = top;
!         *ap++ = "mail";
          if (rflag != NOSTR) {
                  *ap++ = "-r";
                  *ap++ = rflag;
          }
- #ifdef SENDMAIL
          *ap++ = "-i";
          if (metoo)
                  *ap++ = "-m";
          if (verbose)
                  *ap++ = "-v";
          if (hflag) {
                  *ap++ = "-h";
                  snprintf(hbuf, sizeof (hbuf), "%d", hflag);
                  *ap++ = savestr(hbuf);
          }
- #endif /* SENDMAIL */
          while (n != NIL) {
                  if (n->n_type & GDEL) {
                          n = n->n_flink;
                          continue;
                  }
--- 603,638 ----
  
          extra = 2;
  
          if (rflag != NOSTR)
                  extra += 2;
          extra++;
          metoo = value("metoo") != NOSTR;
          if (metoo)
                  extra++;
          verbose = value("verbose") != NOSTR;
          if (verbose)
                  extra++;
          if (hflag)
                  extra += 2;
          top = (char **) salloc((t + extra) * sizeof (char *));
          ap = top;
!         *ap++ = "sendmail";
          if (rflag != NOSTR) {
                  *ap++ = "-r";
                  *ap++ = rflag;
          }
          *ap++ = "-i";
          if (metoo)
                  *ap++ = "-m";
          if (verbose)
                  *ap++ = "-v";
          if (hflag) {
                  *ap++ = "-h";
                  snprintf(hbuf, sizeof (hbuf), "%d", hflag);
                  *ap++ = savestr(hbuf);
          }
          while (n != NIL) {
                  if (n->n_type & GDEL) {
                          n = n->n_flink;
                          continue;
                  }