- p += sprintf(CS p, " -S%s %s", f.deliver_selectstring_sender_regex? "r" : "",
- deliver_selectstring_sender);
+ {
+ snprintf(CS p, big_buffer_size - (p - big_buffer), " -S%s %s",
+ f.deliver_selectstring_sender_regex? "r" : "", deliver_selectstring_sender);
+ p += Ustrlen(CCS p);
+ }