Here is the link to the Wiki page again: http://wiki.dreamhost.com/SMTP_quota
And it goes over the different methods: SMTP, SMTP by DH webmail, Postfix sendmail (CGI/PHP), and Announcement Lists.
"DreamHost "Announce Lists" (configured via our control panel): unlimited recipients per hour
* Max recipients per message: unlimited
* Max message size: 40MB (encoded)
How exactly is that not clear?
Customer since 2000 openvein.org