Hi, As a fresh plesk-user I experienced problems with qmail sending duplicate mail. Sometimes the same mail would be delivered 3-4 times. I solved that problem. A cronjob running /usr/bin/qmail_check (belongs to the package a1dummy-psa753-1.1-1.swsoft) every 10 minutes caused qmail to exit. And when that happened during a mailtransfer qmail didn't clean the queue and the user would receive the same mail once again the next time qmail_check is run. I disabled the cronjob and now qmail stays up all the time, delivering mail immediately (not once every 10 minutes, like before) and no duplicates. One would think this should be the preferred behaviour? But obiously, the previous behaivour is by design. And that makes me wonder why they have designed it this way?