Magento 2 : Adding additional store email addresses in the store admin

Magento 2 allows you to set five email addresses in the store admin:

1. 1.General Contact
2. Sales Representative
3. Customer Support
4. Custom Email 1
5. Custom Email 2

add more

• Custom Email 3
• Custom Email 4
• Custom Email 5
• .
• .
• .
• .
• more.........

Need to create a new module using the below steps

Mycompany/Additionalstoreemail/

registration.php
composer.json
etc/module.xml
etc/adminhtml/system.xml

registration.php
<?php
/**
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Mycompany_Additionalstoreemail',
    __DIR__
);
------------------------------------------------------
composer.json

{
    "name": "mycompany\/additionalstoreemail",
    "description": "Magento 2 Additional Store Email Address",
     "require": {
        "php": "~5.5.22|~5.6.0|7.0.2|7.0.4|~7.0.6|~7.1.0",
        "magento/framework": "100.0.*|100.1.*|101.0.*"
    },
    "type": "magento2-module",
    "version": "1.0.1",
    "license": [
        "OSL-3.0",
        "AFL-3.0"
    ],
    "autoload": {
        "files": [
            "registration.php"
        ],
        "psr-4": {
            "Mycompany\\Additionalstoreemail\\": ""
        }
    }
}

------------------------------------------------------
etc/module.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © 2015 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
    <module name="Mycompany_Additionalstoreemail" setup_version="1.0.1" />
</config>

------------------------------------------------------
etc/adminhtml/system.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <tab id="general" translate="label" sortOrder="100">
            <label>General</label>
        </tab>             
        <section id="trans_email" translate="label" type="text" sortOrder="100" showInDefault="1" showInWebsite="1" showInStore="1">
                   
            <group id="ident_custom3" translate="label" type="text" sortOrder="6" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Custom Email 3</label>
                <field id="email" translate="label" type="text" sortOrder="2" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Sender Email</label>
                    <validate>validate-email</validate>
                    <backend_model>Magento\Config\Model\Config\Backend\Email\Address</backend_model>
                </field>
                <field id="name" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Sender Name</label>
                    <backend_model>Magento\Config\Model\Config\Backend\Email\Sender</backend_model>
                    <validate>validate-emailSender</validate>
                </field>
            </group>
           
            <group id="ident_custom4" translate="label" type="text" sortOrder="7" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Custom Email 4</label>
                <field id="email" translate="label" type="text" sortOrder="2" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Sender Email</label>
                    <validate>validate-email</validate>
                    <backend_model>Magento\Config\Model\Config\Backend\Email\Address</backend_model>
                </field>
                <field id="name" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Sender Name</label>
                    <backend_model>Magento\Config\Model\Config\Backend\Email\Sender</backend_model>
                    <validate>validate-emailSender</validate>
                </field>
            </group>
           
            <group id="ident_custom5" translate="label" type="text" sortOrder="8" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Custom Email 5</label>
                <field id="email" translate="label" type="text" sortOrder="2" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Sender Email</label>
                    <validate>validate-email</validate>
                    <backend_model>Magento\Config\Model\Config\Backend\Email\Address</backend_model>
                </field>
                <field id="name" translate="label" type="text" sortOrder="1" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Sender Name</label>
                    <backend_model>Magento\Config\Model\Config\Backend\Email\Sender</backend_model>
                    <validate>validate-emailSender</validate>
                </field>
            </group>           
           
        </section>       
    </system>
</config>