We can configure and set up your domain emails on ProtonMail Secure Email Based in Switzerland with end-to-end encryption and zero access encryption to secure emails.
For promoting your brands, products or services, sharing news, or simply communicating with your site visitors we can produce branded fully responsive email templates.
We can integrate your mailing lists with external mail marketing services such as MailChimp for example.
Users can subscribe to your mailing lists, newsletters etc, on your web pages.
The basic business model of most large email providers such as Gmail and Yahoo revolves around data collection so there is little or no respect the privacy of your inbox.
Third party access to user emails is common practice as is tracking your purchases along with access by government surveillance agencies.