SMTPD_VERSION
io_printf(pi->io, "config|smtpd-version|%s\n", SMTPD_VERSION);
log_info("version: " SMTPD_NAME " " SMTPD_VERSION);
log_info("info: %s %s starting", SMTPD_NAME, SMTPD_VERSION);
fprintf(priv->out, "config|smtpd-version|"SMTPD_VERSION"\n");