For further information on the issue in the extension powermail, please read the related advisory TYPO3-SA-2010-019 that was published today:
http://typo3.org/teams/security/security-bulletins/typo3-sa-2010-019/
TYPO3 in a Container
The Documentation Team has recently improved the section of the TYPO3 Explained manual that covers how to run TYPO3 in a Docker setup — or more…