Disconnect and logout from IMAP after mail receive (#14103).

Patch by Pierre Pretorius.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11905 e93f8b46-1217-0410-a6f0-8f06a7374b81
Use uid_ methods for retrieving IMAP messages (#14101).

Patch by Pierre Pretorius.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11906 e93f8b46-1217-0410-a6f0-8f06a7374b81