Would anybody have a recommendation for a piece of CRM software which could handle both email and MSM messages in an automated manner? This would be for a medium-sized restaurant, which would like to be able to blast out notices about leftover pizza at third price as MSM messages and, also, send out blurbs as email. Customer lists would be kept as a spreadsheet or small database and, ideally, an incoming email with the word unsubscribe in the subject line should automatically remove that sender from the database.