[Dovecot] mailing lists and Dovecot deliver (lda)

I'm trying to figure out a way, or if it is even possible, to use mailing list software (majordomo2) on a Postfix + Dovecot + virtual mailboxes system. And where I should be looking.

The examples on the Postfix site don't seem to address a purely virtual mailboxes system and I haven't found anything about doing it with deliver.

I think I'm at the wrong tree (Dovecot deliver) and should be pestering the Postfix list.

FTR, I host some sites for not-for-profits and they have asked about setting up lists. So far I've dodged the question but would like to attempt it now.

Thanks, Rod