SymptomsA domain can not be deleted through Parallels Plesk Panel. The domain removal task is finished successfully after termination of mailmng.exe process in Task Manager.
The problem was discovered in Parallels Plesk Panel 9.0 with Merak Mail Server 9.3.2 installed.
ResolutionThe problem will be permanently fixed in future versions of Parallels Plesk Panel.
To apply custom fix it is necessry to downlaod merakproviderw.dll file and copy it to %plesk_bin% folder.
You are recommended to keep original version of the file for backup purposes.