Patch 4.2.0 b do not correct for me the attachement bug for email.
signatures for email do not works yet ... This is the error msg. in adm. or user mode:

Retrieving record by id users_signatures:caa07e74-1b82-7289-0454-443148fd6ba4 found Query Failed:SELECT users_signatures.* , users_signatures_cstm.* FROM users_signatures LEFT JOIN users_signatures_cstm ON users_signatures.id = users_signatures_cstm.id_c WHERE users_signatures.id = 'caa07e74-1b82-7289-0454-443148fd6ba4' LIMIT 0,1::MySQL error 1146: Table 'sugarcrm.users_signatures_cstm' doesn't exist