Please use the mailing list. Direct email to individual developers is selfish and will be ignored.

MySQL C++ API v1.7.1 (branch of MySql++ 1.7) and higher:
  Murray Cumming <murrayc@usa.net>

MySql++ versions 1.2 and higher (1.7):
  Sinisa Milivojevic <sinisa@cytanet.com.cy> or <sinisa@mysql.com>
  Michael Widenius <monty@mysql.com>
  
MySql++ versions before 1.2:
  Kevin Atkinson