pilerimport can read single emails from stdin specifying "-" as the filename

src/misc.h

@@ -29,6 +29,7 @@ int drop_privileges(struct passwd *pwd);
 
 int is_email_address_on_my_domains(char *email, struct __config *cfg);
 void init_session_data(struct session_data *sdata);
+int read_from_stdin(struct session_data *sdata);
 
 #ifndef _GNU_SOURCE
    char *strcasestr(const char *s, const char *find);