The problem is that Email::Store tries to use placeholders when preparing the SQL query, and FreeTDS doesn't support that feature in it's implementation of Sybase's Client Library yet.

I know that they are working on it, but in the meantime the maintainer of Email::Store (or you yourself) need to find a work-around. Maybe by patching Email::Store to allow direct interpolation of parameters in some situations which could be enabled via a flag in the module?

Michael