Can we send out bulk mail from Zimbra? We are an organization that sends out newsletters to about 40,000 contacts. We currently are using a mail relay company, but I am wondering if we can do all of our mailings through Zimbra? We would be sending our mail from an open source software called CiviCRM. CiviCRM allows us to set a mailer batch limit, so I was thinking of sending 50 emails per minute and have the job run each minute.