You can try either Mailman or mlmmj. Personally, i suggest mlmmj.
http://mlmmj.org

You can try mlmmj official document.
I have a doc for a almost working iRedMail + mlmmj setup, but need some more tests, not yet ready for production use.

A short tutorial:

## Setup

/etc/postfix/master.cf:

```
# ${nexthop} is '%d/%u' in transport ('mlmmj:%d/%u')
mlmmj   unix  -       n       n       -       -       pipe
  flags=ORhu user=mlmmj argv=/usr/bin/mlmmj-receive -F -L /var/spool/mlmmj/${nexthop}
#  flags=ORhu user=mlmmj argv=/usr/bin/mlmmj-receive -F -L /var/spool/mlmmj/${domain}/${user}
```

/etc/postfix/main.cf:

```
mlmmj_destination_recipient_limit = 1

virtual_alias_maps = proxy:mysql:/etc/postfix/mysql/mlmmj.cf, ...
transport_maps =
    proxy:mysql:/etc/postfix/mysql/transport_maps_user.cf,
    proxy:mysql:/etc/postfix/mysql/transport_maps_mlmmj.cf,
    proxy:mysql:/etc/postfix/mysql/transport_maps_domain.cf
```

/etc/postfix/mysql/mlmmj.cf:

```
user        = vmail
password    = qsescZvV03f6YUtTMN2bQTejmjatzz
hosts       = 127.0.0.1
port        = 3306
dbname      = vmail
query       = SELECT '%s' FROM alias WHERE address='%s' AND islist=1 AND active=1
```

/etc/postfix/mysql/transport_maps_mlmmj.cf:

```
user        = vmail
password    = qsescZvV03f6YUtTMN2bQTejmjatzz
hosts       = 127.0.0.1
port        = 3306
dbname      = vmail
query       = SELECT 'mlmmj:%d/%u' FROM alias WHERE address='%s' AND islist=1 AND active=1
```

## create new mailing list with mlmmj-agent program

Create a new mailing list with domain.com/listname style:

```
mlmmj-make-ml -L 'alist' -s /var/spool/mlmmj/a.cn -c mlmmj
```

In /var/spool/mlmmj/b.cn/alist/control/customheaders:

```
X-Mailinglist: alist@b.cn
Reply-To: alist@b.cn
```

## References

* http://mlmmj.org/docs/readme-postfix/