MODx Newsletter Options Help

I have a client, that needs muplitple newsletters, ideally managed via MODx but not required, any ideas?

See Mailchimp.

http://www.mailchimp.com/

But do it this way if you don’t mind to give us a little referral lovin’:
http://modxcms.com/community/partners/email-marketing.html

We use MailChimp and have a great workflow. In fact the MODx Newsletter has been profiled about 3 or so times in recent MailChimp blog entries (using the import from URL feature so we use MODx to manage the content).

or use Pommo if you want it independent of MODx