The problem is in the
relay=dovecot part. What you need to do is configure your mailman transport to use
local instead of dovecot. Otherwise, dovecot cannot resolve your virtual domain.
Follow these instructions:
http://wiki.list.org/display/DOC/Mai...+or+other+maps
Ignore point number (2).
Quote:
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Do not put the domains in Postfix virtual_alias_domains, and do not put hash:/path/to/data/virtual_mailman in virtual_alias_maps.
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You need to tell Postfix to map your virtual alias maps. So keep it in there.