🚀 go-pugleaf

Assuming you use sendmail, define a mailer.

Msomename, P=/usr/coconut/someprog, F=lsDFMe,   S=10, R=20, A=someprog $u

S10
R@			$n			errors to mailer-daemon

Then insert this into S0:

# handle special cases
R$*<@tofile>		$#somename:$1
R$*<@tofile.$m>		$#somename:$1

The $m is the domain name here.  It may be something else in your
sendmail.  In this instance, mail to:

	somebody@tofile
or	somebody@tofile.domain.name

will be sent through someprog, which could be a shell...

someprog.c might be

#include <stdio.h>

char
  line[100];

FILE
  *F;

main(argc,argv)
int
  argc;
char
  **argv;
{ if (F = fopen("/usr/coconut/someprog.log","a"))
    { int
	j;
      fprintf(F,"argc = %d\n",argc);
      for (j = 0; j < argc; j++)
	fprintf(F,"argv[%d] = %s\n",j,argv[j]);
      while (fgets(line,100,stdin))
	fputs(line,F);
      fclose(F);
      exit(0); };
  exit(1); }