sehealy Welcome to Microsoft Q & A Community Forum. I’m sorry to hear that you are having trouble with your email delivery subscription from Azure. I can understand how frustrating and confusing this situation must be for you.
Azure Communication Services are cloud-based services with REST APIs and client library SDKs available to help you integrate communication into your applications. The communication formats are Voice and Video Calling, Rich Text Chat, SMS and Email. This service is provided from Azure.
I assume you have heard about azure marketplace. It is an online store that contains thousands of IT software applications and services built by industry-leading technology companies. In Azure Marketplace you can find, try, buy, and deploy the software and services you need to build new solutions and manage your cloud infrastructure. You can also explore popular apps by category, workload, or industry. Azure Marketplace offers solutions that are certified and optimized to run on Azure, so you can enjoy the benefits of a single bill, defined user roles and permissions, flexible pricing options, and innovation with pre-built apps. Azure Marketplace is the premier destination for all your software needs in the cloud.
In short, SendGrid and Socket Labs are third party solutions for email which are certified and optimized to run on Azure. These are available as Azure Marketplace offers. From the information provided, I assume you are using one of the azure marketplaces offers. For azure marketplace offers, respective service providers will provide assistance on their products.
You can search the respective service within azure marketplace (https://azuremarketplace.microsoft.com/en-us/home ) .The pricing details and support options are provided in the same page. Here are the links for the services you are using. Do check out and let me know if you have any questions.