If a list of emails is bigger than 500, the email was sent several time to some people. The mail_values content was not reset between each batch, so if 1200 emails are sent, 3 mail.mail records were created for the emails in the first group. closes odoo/odoo#93658 X-original-commit: f838a0cc36e51e0f47daeec6522df8e9832aad2c Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>