It's actually very simple to add e-mail to your project or your website. It's sometimes even easier to add the e-mail externally via any kind of Web service than using a local SMTP service like C-Servers offers.
All you need to do in those cases is to update the MX records in your domain registrar (e.g. mx.email-provider.com, where email-provider is the name of your own web email service), and you're basically set.
There are multiple others available, including (but not limited to) Exchange Online, Google Workspaces, Microsoft 365 and many, many others.