Based on my understanding of your question - Azure Communication Services Email is a new primitive that facilitates high volume transactional, bulk and marketing emails on the Azure Communication Services platform and will enable Application-to-Person (A2P) use cases. Azure Communication Services Email is going to simplify the integration of email capabilities to your applications using production-ready email SDK options
Kindly take a look at this doc for additional info : Email in Azure Communication Services.
Email - Send - REST API - Take a look at the sample send email sample request
Note: This feature of Azure Communication Services is currently in public preview (are not recommended for production workloads).
Hope this points you in the right direction, if you have additional questions, you may share more details about your requirement.
With azure-communication-service tag added, I have shared more info pertaining to this service.
With Azure Logic Apps and the Simple Mail Transfer Protocol (SMTP) connector, you can create automated tasks and workflows that send email from your SMTP account. You can also have other actions use the output from SMTP actions.
Tutorial: Send email and invoke other business processes from App Service