/*
* Translate the last component of the sender address. If the translation
* yields the same address, replace the sender with its last component.
*/
void
gateway(message *mp)
{
char *base;
String *s;
/* first remove all systems equivalent to us */
base = skipequiv(s_to_c(mp->sender));
if(base != s_to_c(mp->sender)){
s = mp->sender;
mp->sender = s_copy(base);
s_free(s);
}
}
