make a group module in this add update delete group or also import or export contact group wise
make Campaign module in this add campaign when campaign added also create tranmission acoding to group contacts update campaign or delete campaign start and stop campaign or schedule
make a group module in this add update delete group or also import or export contact group wise make Campaign module in this add campaign when campaign added also create tranmission acoding to group contacts update campaign or delete campaign start and stop campaign or schedule