DM = status in ECAS only, no email notification
Decision Made does not specifically mean visa is stamped - it means that the VO had made a final decision on your admissibility. After this - on a successful/positive admissibility decision - instructions are made to print out the CoPRs, visa counterfoil and then affixing (commonly mis-termed as "stamping") to the passport, the printed visa counterfoil. Then the package consisting of the PPs, CoPRs and other instructions/letters are sent to the courier for delivery to the applicant.