1) Download sources from:
http://www.sqlite.org/download.html
2) Copy source files to /Mail/3rdParty/sqlite3/ Build project (Release)
3) Copy file libsqlite3.a from /Mail/3rdParty/sqlite3/release/ to /Mail/libs
Copy file sqlite3.h from /Mail/3rdParty/sqlite3/ to /Mail/include
4) Build project Mail.
Done