I've just uploaded the 2.1.0 sources to SF. The new release features implementation of IMAPS secure protocol and STARTTLS IMAP extension, and (hopefully) fixes the folder doubling contents bug. There are also other enhancements and bug fixes.
Misteriously, the ishmail-1.9.12.tar.gz file uploaded yesterday contained sources of _1.9.11_, in fact.
CVS tree has been imported.