mailman3-manage-qmail.sh

#!/bin/sh
if [ $# = 2 ]
then
  i=$2
  p=61902 # Change this - first free port

  if [ $1 = "add" ]
  then
    echo Making links to $i in home directory...
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-admin
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-bounces
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-confirm
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-join
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-leave
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-owner
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-request
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-subscribe
    echo "|/home/`whoami`/bin/qmail-lmtp $p 1" > ~/.qmail-$i-unsubscribe
  elif [ $1 = "del" ]
  then
    echo "Removing qmail files for $i"
    rm ~/.qmail-$i
    rm ~/.qmail-$i-*
  else 
    echo "Unkown parameters. Usage: mailman3-list [add, del] listname"
  fi
else 
  echo "Unkown parameters. Usage: mailman3-list [add, del] listname"
fi

This shell script creates or deletes all necessary .qmail files for use with mailman3. Make sure to change p to your mailman's LMTP port and make the script executable!