I am trying to understand Server Action in which when a state is changed from draft to confirm, a message is sent to the email provided.

There is no error as such in program, but the mail is not sent to custom email.

The codes are as follows:

notebook_server_action.xml:

<!-- demo automated actions sending message after state transition -->
<record id="filter_draft_lead" model="ir.filters">
    <field name="name">Draft Leads notebook</field>
    <field name="model_id">notebook.server_action</field>
    <field name="domain">[('state','=','confirm')]</field>
    <field name="user_id" eval="False" />
</record>
<record id="action_email_reminder_lead" model="ir.actions.server">
    <field name="name">Message @ confirm state</field>
    <field name="model_id" ref="model_notebook_server_action" />
    <field name="condition">True</field>
    <field name="type">ir.actions.server</field>
    <field name="state">email</field>
    <field name="email">object.email</field>
    <field name="subject">Check 1 2 3</field>
    <field name="message">11111111111111</field>
</record>
<record id="rule_set_reminder_lead" model="base.action.rule">
    <field name="name">Send mail when status changed to confirm</field>
    <field name="model_id" ref="model_notebook_server_action" />
    <field name="sequence">1</field>
    <field name="filter_id" ref="filter_draft_lead" />
    <field name="trg_date_id" ref="field_notebook_server_action_note_date" />
    <field name="trg_date_range">0</field>
    <field name="trg_date_range_type">minutes</field>
    <field name="server_action_ids" eval="[(6,0,[ref('action_email_reminder_lead')])]" />
</record>

notebook.py

class notebook(osv.osv):
    _name = "notebook.server_action"
    _description = "Simple Notebook"
    _columns = {
        'name' : fields.char('Title', size=30, required=True),
        'note' : fields.text('Note'),
        'email': fields.char('Email', size=120, required=True),
        'note_date' : fields.datetime('Date'),
        'state': fields.selection([('draft', 'Draft'), ('confirm', 'Confirmed')],
            'Status', required=True, readonly=True),
            }
    _defaults = {
        'state': 'draft',
        'note_date' : lambda *a: time.strftime('%Y-%m-%d %H:%M:%S'),
    }
    def button_confirm(self, cr, uid, ids, context=None):
        return self.write(cr, uid, ids, {'state': 'confirm'})

notebook_view.xml

<record model="ir.ui.view" id="notebook_server_actiontree_view">
    <field name="name">notebook.server_action.tree</field>
    <field name="model">notebook.server_action</field>
    <field name="arch" type="xml">
        <tree string="Notebook">
            <field name="name" />
            <field name="note" />
            <field name="note_date" />
        </tree>
    </field>
</record>
<record model="ir.ui.view" id="notebook_server_actionform_view">
    <field name="name">notebook.server_action.form</field>
    <field name="model">notebook.server_action</field>
    <field name="arch" type="xml">
        <form string="Notebook" version="7.0">
            <header>
                <button name="button_confirm" states="draft" string="Confirm"
                    type="object" />
                <field name="state" widget="statusbar" />
            </header>
            <sheet>
                <group>
                    <field name="name" />
                    <field name="note" />
                    <field name="note_date" />
                </group>
            </sheet>
        </form>
    </field>
</record>
<record model="ir.actions.act_window" id="action_notebook_server_actionform">
    <field name="name">notebook.server_action</field>