3x Magento Master
You can get all the CMS page collection in Magento 2 by calling interface, Magento\Cms\Api\PageRepositoryInterface.
PageRepositoryInterface is used when you need to fetch a collection of CMS page or get specific CMS page data.
You need to instantiate Interface in __construct() method of Class.
Magento 2, Get Referer url by calling function getRefererUrl() or getRedirectUrl() from RedirectInterface Object.
Magento core Interface, Magento\Framework\App\Response\RedirectInterface used for fetching Referer URL.
To send custom email in Magento 2 using the module, We need to create a custom module to send email to a specific recipient.
Out of the box, Magento Provides multiple mail template, like Sales Order, Customer mails, Contacts and so on.
If you want to send your custom mail functionality using Magento 2, You need to create a simple module and create a custom template file using Module for mail body.