auth_signup/views/auth_signup_templates_email.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <template id="reset_password_email" name="User Reset Password">
        <table border="0" cellpadding="0" cellspacing="0" style="padding-top: 16px; background-color: #FFFFFF; font-family:Verdana, Arial,sans-serif; color: #454748; width: 100%; border-collapse:separate;"><tr><td align="center">
        <table border="0" cellpadding="0" cellspacing="0" width="590" style="padding: 16px; background-color: #FFFFFF; color: #454748; border-collapse:separate;">
        <tbody>
            <!-- HEADER -->
            <tr>
                <td align="center" style="min-width: 590px;">
                    <table border="0" cellpadding="0" cellspacing="0" width="590" style="min-width: 590px; background-color: white; padding: 0px 8px 0px 8px; border-collapse:separate;">
                        <tr><td valign="middle">
                            <span style="font-size: 10px;">Your Account</span><br/>
                            <span style="font-size: 20px; font-weight: bold;">
                                <t t-out="object.name or ''">Marc Demo</t>
                            </span>
                        </td><td valign="middle" align="right" t-if="not object.company_id.uses_default_logo">
                            <img t-attf-src="/logo.png?company={{ object.company_id.id }}" style="padding: 0px; margin: 0px; height: auto; width: 80px;" t-att-alt="object.company_id.name"/>
                        </td></tr>
                        <tr><td colspan="2" style="text-align:center;">
                          <hr width="100%" style="background-color:rgb(204,204,204);border:medium none;clear:both;display:block;font-size:0px;min-height:1px;line-height:0; margin: 16px 0px 16px 0px;"/>
                        </td></tr>
                    </table>
                </td>
            </tr>
            <!-- CONTENT -->
            <tr>
                <td align="center" style="min-width: 590px;">
                    <table border="0" cellpadding="0" cellspacing="0" width="590" style="min-width: 590px; background-color: white; padding: 0px 8px 0px 8px; border-collapse:separate;">
                        <tr><td valign="top" style="font-size: 13px;">
                            <div>
                                Dear <t t-out="object.name or ''">Marc Demo</t>,<br/><br/>
                                A password reset was requested for the Odoo account linked to this email.
                                You may change your password by following this link which will remain valid during 24 hours:<br/>
                                <div style="margin: 16px 0px 16px 0px;">
                                    <a t-att-href="object.signup_url"
                                        style="background-color: #875A7B; padding: 8px 16px 8px 16px; text-decoration: none; color: #fff; border-radius: 5px; font-size:13px;">
                                        Change password
                                    </a>
                                </div>
                                If you do not expect this, you can safely ignore this email.<br/><br/>
                                Thanks,
                                <t t-if="user.signature">
                                    <br/>
                                    <t t-out="user.signature">--<br/>Mitchell Admin</t>
                                </t>
                            </div>
                        </td></tr>
                        <tr><td style="text-align:center;">
                          <hr width="100%" style="background-color:rgb(204,204,204);border:medium none;clear:both;display:block;font-size:0px;min-height:1px;line-height:0; margin: 16px 0px 16px 0px;"/>
                        </td></tr>
                    </table>
                </td>
            </tr>
            <!-- FOOTER -->
            <tr>
                <td align="center" style="min-width: 590px;">
                    <table border="0" cellpadding="0" cellspacing="0" width="590" style="min-width: 590px; background-color: white; font-size: 11px; padding: 0px 8px 0px 8px; border-collapse:separate;">
                        <tr><td valign="middle" align="left">
                            <t t-out="object.company_id.name or ''">YourCompany</t>
                        </td></tr>
                        <tr><td valign="middle" align="left" style="opacity: 0.7;">
                            <t t-out="object.company_id.phone or ''">+1 650-123-4567</t>

                            <t t-if="object.company_id.email">
                                | <a t-att-href="'mailto:%s' % object.company_id.email" style="text-decoration:none; color: #454748;" t-out="object.company_id.email">info@yourcompany.com</a>
                            </t>
                            <t t-if="object.company_id.website">
                                | <a t-att-href="'%s' % object.company_id.website" style="text-decoration:none; color: #454748;" t-out="object.company_id.website">http://www.example.com</a>
                            </t>
                        </td></tr>
                    </table>
                </td>
            </tr>
        </tbody>
        </table>
        </td></tr>
        <!-- POWERED BY -->
        <tr><td align="center" style="min-width: 590px;">
            <table border="0" cellpadding="0" cellspacing="0" width="590" style="min-width: 590px; background-color: #F1F1F1; color: #454748; padding: 8px; border-collapse:separate;">
              <tr><td style="text-align: center; font-size: 13px;">
                Powered by <a target="_blank" href="https://www.odoo.com?utm_source=db&amp;utm_medium=auth" style="color: #875A7B;">Odoo</a>
              </td></tr>
            </table>
        </td></tr>
        </table>
    </template>

    <template id="alert_login_new_device" name="Alert Login with new Device">
        <table border="0" cellpadding="0" cellspacing="0" style="padding-top: 16px; background-color: #FFFFFF; font-family:Verdana, Arial,sans-serif; color: #454748; width: 100%; border-collapse:separate;"><tr><td align="center">
        <table border="0" cellpadding="0" cellspacing="0" width="590" style="padding: 16px; background-color: #FFFFFF; color: #454748; border-collapse:separate;">
        <tbody>
            <!-- HEADER -->
            <tr>
                <td align="center" style="min-width: 590px;">
                    <table border="0" cellpadding="0" cellspacing="0" width="590" style="min-width: 590px; background-color: white; padding: 0px 8px 0px 8px; border-collapse:separate;">
                    <tr><td valign="top" style="font-size: 13px;">
                    <div>
                        Dear <t t-out="object.name or ''">Marc Demo</t>,<br/><br/>
                        A new device was used to sign in to your account. <br/><br/>
                        Here are some details about the connection:<br/>
                        <ul>
                            <li><span style="font-weight: bold;">
                                Date:</span> <t t-out="format_datetime(login_date, dt_format='long')">day, month dd, yyyy - hh:mm:ss (GMT)</t></li>
                            <t t-if="location_address">
                                <li><span style="font-weight: bold;">
                                    Location:</span> <t t-out="location_address">City, Region, Country</t></li>
                            </t>
                            <t t-if="useros">
                                <li><span style="font-weight: bold;">
                                    Platform:</span> <t t-out="useros">OS</t></li>
                            </t>
                            <t t-if="browser">
                                <li><span style="font-weight: bold;">
                                    Browser:</span> <t t-out="browser">Browser</t></li>
                            </t>
                            <li><span style="font-weight: bold;">
                                IP Address:</span> <t t-out="ip_address">111.222.333.444</t></li>
                        </ul>
                        If you don't recognize it, you should change your password immediately via this link:<br/>
                        <div style="margin: 16px 0px 16px 0px;">
                            <a t-attf-href="{{ object.get_base_url() }}/web/reset_password"
                                style="background-color: #875A7B; padding: 8px 16px 8px 16px; text-decoration: none; color: #fff; border-radius: 5px; font-size:13px;">
                                Reset Password
                            </a>
                        </div>
                        Otherwise, you can safely ignore this email.

                    </div>
                    </td></tr>
                    <tr><td style="text-align:center;">
                      <hr width="100%" style="background-color:rgb(204,204,204);border:medium none;clear:both;display:block;font-size:0px;min-height:1px;line-height:0; margin: 16px 0px 16px 0px;"/>
                    </td></tr>
                    </table>
                </td>
            </tr>
        </tbody>
        </table>
        </td></tr>
        <!-- POWERED BY -->
        <tr><td align="center" style="min-width: 590px;">
            <table border="0" cellpadding="0" cellspacing="0" width="590" style="min-width: 590px; background-color: #F1F1F1; color: #454748; padding: 8px; border-collapse:separate;">
              <tr><td style="text-align: center; font-size: 13px;">
                Powered by <a target="_blank" href="https://www.odoo.com?utm_source=db&amp;utm_medium=auth" style="color: #875A7B;">Odoo</a>
              </td></tr>
            </table>
        </td></tr>
        </table>
    </template>

</odoo>