I have a email field  sender_address  computed like:

    sender_address = fields.Char(
        string='Sender email address', readonly=True, store=True,
        compute='_compute_sender_address', index=True)
    @api.multi
    @api.depends('sender')
    def _compute_sender_address(self):
        for email in self:
            if email.sender:
                matches = re.search(r'<(.*@.*)>', email.sender)
                if matches:
                    email.sender_address = matches.group(1).lower()
                else:
                    email.sender_address = email.sender.lower()
            else:
                email.sender_address = False

Then I would like to use this email address to get res.users id:

    # get sender user_id
    sender_id = fields.Many2one(
        string='Sender User ID', comodel_name='res.users', readonly=True, store=True,
        compute='_compute_sender_id', index=True)
    @api.multi
    @api.depends('sender_address')
    def _compute_sender_id(self):
        for email in self:
            if email.sender_address:
                email.sender_id = self.env['res.users'].search([('email', 'ilike', 'email.sender_address')], limit=1)
            else:
                email.sender_id = False

 print send_address is correct, but no sender_id.

There's no error in log, please help me how to find problem.