TRACE_SMTPCLT
log_trace(TRACE_SMTPCLT, "%p: %s -> %s", proto,
log_trace(TRACE_SMTPCLT, "%p: <<< %s", proto, line);
log_trace(TRACE_SMTPCLT, "%p: >>> [...%zd bytes...]", proto, w);
log_trace(TRACE_SMTPCLT, "mta: %p: >>> %s", proto, p);