Something

#!/bin/sh
exec 2>&1 \
envdir ./env \
sh -c '
    case "$REMOTENAME" in h) H=;; p) H=p;; *) H=H;; esac
    case "$REMOTEINFO" in r) R=;; [0-9]*) R="t$REMOTEINFO";; *) R=R;; esac
    exec \
    softlimit ${DATALIMIT+"-d$DATALIMIT"} \
    /usr/local/bin/tcpserver \
        -vD"$H$R" \
        ${LOCALNAME+"-l$LOCALNAME"} \
        ${BACKLOG+"-b$BACKLOG"} \
        ${CONCURRENCY+"-c$CONCURRENCY"} \
        -xtcp.cdb \
        -- "${IP-0}" "${PORT-110}" \
    /var/qmail/bin/qmail-popup "${POPUPHOST-`sed 1q /var/qmail/control/me`}" \
    /usr/local/vpopmail/bin/vchkpw \
    /var/qmail/bin/qmail-pop3d "${MAILDIRNAME-Maildir}"
'