If you receive the following dovecot error:

dovecot: imap-login: imap-login: error while loading shared libraries: libsepol.so.1: failed to map segment from shared object: Cannot allocate memory

See this link for details: 

http://www.cyberciti.biz/tips/rhel-dovecot-error-while-loading-shared-libraries.html#comment-143527

It saved me a lot of time!

Thanks, Falko, for the excellent ISPConfig and the how-to!