diff --git a/custom-words.txt b/custom-words.txt
index ccb191e08946..9b7b49489de5 100644
--- a/custom-words.txt
+++ b/custom-words.txt
@@ -1785,6 +1785,7 @@ routable
 routingendpointhealth
 rpki
 RPKI
+rpmsg
 rpns
 RSAES
 RSASSA
diff --git a/specification/communication/data-plane/Email/preview/2021-10-01-preview/CommunicationServicesEmail.json b/specification/communication/data-plane/Email/preview/2021-10-01-preview/CommunicationServicesEmail.json
new file mode 100644
index 000000000000..1a427a342c99
--- /dev/null
+++ b/specification/communication/data-plane/Email/preview/2021-10-01-preview/CommunicationServicesEmail.json
@@ -0,0 +1,461 @@
+{
+  "swagger": "2.0",
+  "info": {
+    "title": "CommunicationEmailClient",
+    "description": "Azure Communication Email Service",
+    "version": "2021-10-01-preview"
+  },
+  "paths": {
+    "/emails/{messageId}/status": {
+      "get": {
+        "tags": [
+          "EmailGetSendStatus"
+        ],
+        "summary": "Gets the status of a message sent previously.",
+        "operationId": "Email_GetSendStatus",
+        "produces": [
+          "application/json"
+        ],
+        "consumes": [
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "in": "path",
+            "name": "messageId",
+            "description": "System generated message id (GUID) returned from a previous call to send email",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          }
+        ],
+        "responses": {
+          "default": {
+            "description": "Error",
+            "headers": {
+              "x-ms-error-code": {
+                "description": "Error code - this will be the same as the code in the error property in the response body.",
+                "type": "string"
+              }
+            },
+            "schema": {
+              "$ref": "../../../Common/stable/2021-03-07/common.json#/definitions/CommunicationErrorResponse"
+            }
+          },
+          "200": {
+            "description": "Message status was successfully retrieved.",
+            "headers": {
+              "Retry-After": {
+                "description": "Amount of time client should wait before retrying the request, specified in seconds ",
+                "type": "integer"
+              }
+            },
+            "schema": {
+              "$ref": "#/definitions/SendStatusResult"
+            }
+          }
+        },
+        "x-ms-examples": {
+          "Get Message Status": {
+            "$ref": "./examples/GetSendStatus.json"
+          }
+        }
+      }
+    },
+    "/emails:send": {
+      "post": {
+        "tags": [
+          "EmailSend"
+        ],
+        "summary": "Queues an email message to be sent to one or more recipients",
+        "operationId": "Email_Send",
+        "consumes": [
+          "application/json"
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "parameters": [
+          {
+            "in": "header",
+            "name": "repeatability-request-id",
+            "description": "If specified, the client directs that the request is repeatable; that is, that the client can make the request multiple times with the same Repeatability-Request-Id and get back an appropriate response without the server executing the request multiple times. The value of the Repeatability-Request-Id is an opaque string representing a client-generated, globally unique for all time, identifier for the request. It is recommended to use version 4 (random) UUIDs.",
+            "type": "string",
+            "required": true
+          },
+          {
+            "in": "header",
+            "name": "repeatability-first-sent",
+            "description": "Must be sent by clients to specify that a request is repeatable. Repeatability-First-Sent is used to specify the date and time at which the request was first created in the IMF-fix date form of HTTP-date as defined in RFC7231. eg- Tue, 26 Mar 2019 16:06:51 GMT",
+            "type": "string",
+            "required": true
+          },
+          {
+            "$ref": "#/parameters/ApiVersionParameter"
+          },
+          {
+            "in": "body",
+            "name": "emailMessage",
+            "description": "Message payload for sending an email",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/EmailMessage"
+            }
+          }
+        ],
+        "responses": {
+          "default": {
+            "description": "Error",
+            "headers": {
+              "x-ms-error-code": {
+                "description": "Error code - this will be the same as the code in the error property in the response body.",
+                "type": "string"
+              }
+            },
+            "schema": {
+              "$ref": "../../../Common/stable/2021-03-07/common.json#/definitions/CommunicationErrorResponse"
+            }
+          },
+          "202": {
+            "description": "Message accepted, the `Operation-Location` header contains the URL to poll for the message status.",
+            "headers": {
+              "Repeatability-Result": {
+                "description": "Status of a repeatable request.",
+                "type": "string"
+              },
+              "Operation-Location": {
+                "description": "Location url of where to poll the status of this message from.",
+                "type": "string"
+              },
+              "Retry-After": {
+                "description": "Amount of time client should wait before retrying the request, specified in seconds ",
+                "type": "integer"
+              },
+              "x-ms-request-id": {
+                "description": "System generated GUID indicating the id of this specific message, to be used for tracking purposes.",
+                "type": "string"
+              }
+            }
+          }
+        },
+        "x-ms-examples": {
+          "Send Email": {
+            "$ref": "./examples/SendEmail.json"
+          }
+        }
+      }
+    }
+  },
+  "definitions": {
+    "EmailMessage": {
+      "description": "Message payload for sending an email",
+      "required": [
+        "sender",
+        "content",
+        "recipients"
+      ],
+      "type": "object",
+      "properties": {
+        "headers": {
+          "description": "Custom email headers to be passed.",
+          "type": "array",
+          "x-ms-client-name": "CustomHeaders",
+          "items": {
+            "$ref": "#/definitions/EmailCustomHeader"
+          }
+        },
+        "sender": {
+          "description": "Sender email address from a verified domain.",
+          "type": "string",
+          "example": "info@contoso.com"
+        },
+        "content": {
+          "description": "Email content to be sent.",
+          "$ref": "#/definitions/EmailContent"
+        },
+        "importance": {
+          "description": "The importance type for the email.",
+          "$ref": "#/definitions/EmailImportance"
+        },
+        "recipients": {
+          "description": "Recipients for the email.",
+          "$ref": "#/definitions/EmailRecipients"
+        },
+        "attachments": {
+          "description": "list of attachments",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/EmailAttachment"
+          }
+        },
+        "replyTo": {
+          "description": "Email addresses where recipients' replies will be sent to.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/EmailAddress"
+          }
+        },
+        "disableUserEngagementTracking": {
+          "description": "Indicates whether user engagement tracking should be disabled for this request if the resource-level user engagement tracking setting was already enabled in the control plane.",
+          "type": "boolean"
+        }
+      }
+    },
+    "EmailCustomHeader": {
+      "description": "Custom header for email.",
+      "type": "object",
+      "required": [
+        "name",
+        "value"
+      ],
+      "properties": {
+        "name": {
+          "description": "Header name.",
+          "type": "string",
+          "example": ""
+        },
+        "value": {
+          "description": "Header value.",
+          "type": "string",
+          "example": ""
+        }
+      }
+    },
+    "EmailAddress": {
+      "description": "An object representing the email address and its display name",
+      "type": "object",
+      "required": [
+        "email"
+      ],
+      "properties": {
+        "email": {
+          "description": "Email address.",
+          "type": "string",
+          "example": "abc@contoso.com"
+        },
+        "displayName": {
+          "description": "Email display name.",
+          "type": "string",
+          "example": "abc"
+        }
+      }
+    },
+    "EmailContent": {
+      "description": "Content of the email.",
+      "type": "object",
+      "required": [
+        "subject"
+      ],
+      "properties": {
+        "subject": {
+          "description": "Subject of the email message",
+          "type": "string",
+          "example": "An exciting offer especially for you!"
+        },
+        "plainText": {
+          "description": "Plain text version of the email message.",
+          "type": "string",
+          "example": "This exciting offer was created especially for you, our most loyal customer."
+        },
+        "html": {
+          "description": "Html version of the email message.",
+          "type": "string",
+          "example": "<html><head><title>Exciting offer!</title>        <style>
          .commit-tease,
          .user-profile-mini-avatar,
          .avatar,
          .vcard-details,
          .signup-prompt-bg {
            display: none !IMPORTANT;
          }
        </style>
         <script>
          document.addEventListener('DOMContentLoaded', function() {
            this.querySelectorAll('a').forEach(anchor => {
              anchor.addEventListener('click', e => {
                e.preventDefault();

                const redact = new URLSearchParams(window.location.search).get('redact');
                const hasExistingParams = anchor.href.includes('?');
                window.location.href = anchor.href + (hasExistingParams ? `&redact=${redact}` : `?redact=${redact}`);
              });
            });
          });
        </script>
 </head><body><h1>This exciting offer was created especially for you, our most loyal customer.</h1></body></html>"
+        }
+      }
+    },
+    "EmailImportance": {
+      "description": "The importance type for the email.",
+      "enum": [
+        "high",
+        "normal",
+        "low"
+      ],
+      "type": "string",
+      "default": "normal",
+      "x-ms-enum": {
+        "name": "EmailImportance",
+        "modelAsString": true
+      }
+    },
+    "EmailAttachment": {
+      "description": "Attachment to the email.",
+      "type": "object",
+      "required": [
+        "name",
+        "attachmentType",
+        "contentBytesBase64"
+      ],
+      "properties": {
+        "name": {
+          "description": "Name of the attachment",
+          "type": "string",
+          "example": "attachment.pdf"
+        },
+        "attachmentType": {
+          "$ref": "#/definitions/EmailAttachmentType"
+        },
+        "contentBytesBase64": {
+          "description": "Base64 encoded contents of the attachment",
+          "type": "string",
+          "example": "TWFueSBoYW5kcyBtYWtlIGxpZ2h0I"
+        }
+      }
+    },
+    "EmailAttachmentType": {
+      "description": "The type of attachment file.",
+      "enum": [
+        "avi",
+        "bmp",
+        "doc",
+        "docm",
+        "docx",
+        "gif",
+        "jpeg",
+        "mp3",
+        "one",
+        "pdf",
+        "png",
+        "ppsm",
+        "ppsx",
+        "ppt",
+        "pptm",
+        "pptx",
+        "pub",
+        "rpmsg",
+        "rtf",
+        "tif",
+        "txt",
+        "vsd",
+        "wav",
+        "wma",
+        "xls",
+        "xlsb",
+        "xlsm",
+        "xlsx"
+      ],
+      "type": "string",
+      "x-ms-enum": {
+        "name": "EmailAttachmentType",
+        "modelAsString": true
+      }
+    },
+    "EmailRecipients": {
+      "description": "Recipients of the email",
+      "type": "object",
+      "required": [
+        "to"
+      ],
+      "properties": {
+        "to": {
+          "description": "Email To recipients",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/EmailAddress"
+          }
+        },
+        "CC": {
+          "description": "Email CC recipients",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/EmailAddress"
+          }
+        },
+        "bCC": {
+          "description": "Email BCC recipients",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/EmailAddress"
+          }
+        }
+      }
+    },
+    "SendStatusResult": {
+      "description": "Status of an email message that was sent previously.",
+      "type": "object",
+      "required": [
+        "messageId",
+        "status"
+      ],
+      "properties": {
+        "messageId": {
+          "description": "System generated id of an email message sent.",
+          "type": "string",
+          "example": "F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4"
+        },
+        "status": {
+          "$ref": "#/definitions/SendStatus"
+        }
+      }
+    },
+    "SendStatus": {
+      "description": "The type indicating the status of a request.",
+      "enum": [
+        "queued",
+        "outForDelivery",
+        "dropped"
+      ],
+      "type": "string",
+      "x-ms-enum": {
+        "name": "SendStatus",
+        "modelAsString": true,
+        "values": [
+          {
+            "value": "queued",
+            "description": "The message has passed basic validations and has been queued to be processed further."
+          },
+          {
+            "value": "outForDelivery",
+            "description": "The message has been processed and is now out for delivery."
+          },
+          {
+            "value": "dropped",
+            "description": "The message could not be processed and was dropped."
+          }
+        ]
+      }
+    }
+  },
+  "parameters": {
+    "ApiVersionParameter": {
+      "in": "query",
+      "name": "api-version",
+      "description": "Version of API to invoke.",
+      "required": true,
+      "enum": [
+        "2021-10-01-preview"
+      ],
+      "type": "string"
+    }
+  },
+  "securityDefinitions": {
+    "Authorization": {
+      "type": "apiKey",
+      "name": "Authorization",
+      "in": "header",
+      "description": "An authentication string containing a signature generated using HMAC-SHA256 scheme."
+    }
+  },
+  "security": [
+    {
+      "Authorization": []
+    }
+  ],
+  "x-ms-parameterized-host": {
+    "hostTemplate": "{endpoint}",
+    "useSchemePrefix": false,
+    "parameters": [
+      {
+        "name": "endpoint",
+        "description": "The communication resource, for example https://my-resource.communication.azure.com",
+        "required": true,
+        "type": "string",
+        "in": "path",
+        "x-ms-skip-url-encoding": true,
+        "x-ms-parameter-location": "client"
+      }
+    ]
+  }
+}
diff --git a/specification/communication/data-plane/Email/preview/2021-10-01-preview/examples/GetSendStatus.json b/specification/communication/data-plane/Email/preview/2021-10-01-preview/examples/GetSendStatus.json
new file mode 100644
index 000000000000..31bb078abc0e
--- /dev/null
+++ b/specification/communication/data-plane/Email/preview/2021-10-01-preview/examples/GetSendStatus.json
@@ -0,0 +1,19 @@
+{
+  "parameters": {
+    "endpoint": "https://contoso.westus.communications.azure.com",
+    "api-version": "2021-10-01-preview",
+    "authorization": "HMAC-SHA256 SignedHeaders=x-ms-date;host;x-ms-content-sha256&Signature=aaaa",
+    "messageId": "F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4"
+  },
+  "responses": {
+    "200": {
+      "headers": {
+        "Retry-After": 100
+      },
+      "body": {
+        "messageId": "F9168C5E-CEB2-4faa-B6BF-329BF39FA1E4",
+        "status": "queued"
+      }
+    }
+  }
+}
diff --git a/specification/communication/data-plane/Email/preview/2021-10-01-preview/examples/SendEmail.json b/specification/communication/data-plane/Email/preview/2021-10-01-preview/examples/SendEmail.json
new file mode 100644
index 000000000000..331b415fa3a9
--- /dev/null
+++ b/specification/communication/data-plane/Email/preview/2021-10-01-preview/examples/SendEmail.json
@@ -0,0 +1,89 @@
+{
+  "parameters": {
+    "endpoint": "https://contoso.westus.communications.azure.com",
+    "api-version": "2021-10-01-preview",
+    "repeatability-request-id": "8540c0de-899f-5cce-acb5-3ec493af3800",
+    "repeatability-first-sent": "Sun, 06 Nov 1994 08:49:37 GMT",
+    "authorization": "HMAC-SHA256 SignedHeaders=x-ms-date;host;x-ms-content-sha256&Signature=aaaa",
+    "emailMessage": {
+      "headers": [
+        {
+          "name": "ClientCorrelationId",
+          "value": "123"
+        },
+        {
+          "name": "ClientCustomHeaderName",
+          "value": "ClientCustomHeaderValue"
+        }
+      ],
+      "sender": "abc@domain.com",
+      "content": {
+        "subject": "An exciting offer especially for you!",
+        "plainText": "This exciting offer was created especially for you, our most loyal customer.",
+        "html": "<html><head><title>Exciting offer!</title>        <style>
          .commit-tease,
          .user-profile-mini-avatar,
          .avatar,
          .vcard-details,
          .signup-prompt-bg {
            display: none !IMPORTANT;
          }
        </style>
         <script>
          document.addEventListener('DOMContentLoaded', function() {
            this.querySelectorAll('a').forEach(anchor => {
              anchor.addEventListener('click', e => {
                e.preventDefault();

                const redact = new URLSearchParams(window.location.search).get('redact');
                const hasExistingParams = anchor.href.includes('?');
                window.location.href = anchor.href + (hasExistingParams ? `&redact=${redact}` : `?redact=${redact}`);
              });
            });
          });
        </script>
 </head><body><h1>This exciting offer was created especially for you, our most loyal customer.</h1></body></html>"
+      },
+      "importance": "normal",
+      "recipients": {
+        "to": [
+          {
+            "email": "john.doe@domain.com",
+            "displayName": "John Doe"
+          },
+          {
+            "email": "jane.doe@domain2.com",
+            "displayName": "Jane Doe"
+          }
+        ],
+        "CC": [
+          {
+            "email": "wendy@someotherdomain.com",
+            "displayName": "Wendy"
+          },
+          {
+            "email": "jimmy@anotherdomain.com",
+            "displayName": "Jimmy Johns"
+          }
+        ],
+        "bCC": [
+          {
+            "email": "bob@anotherdomain.com",
+            "displayName": "Bob"
+          },
+          {
+            "email": "mail@yetanotherdomain.com",
+            "displayName": "Another DisplayName"
+          }
+        ]
+      },
+      "attachments": [
+        {
+          "name": "MyAttachment.pdf",
+          "attachmentType": "pdf",
+          "contentBytesBase64": "TWFueSBoYW5kcyBtYWtlIGxpZ2h0IHdvcmsu"
+        },
+        {
+          "name": "MyAttachment2.docx",
+          "attachmentType": "docx",
+          "contentBytesBase64": "pZ2h0IHdvcmsu5kcyBtYWtlIGxpZ2h0IHdvcmsu"
+        }
+      ],
+      "replyTo": [
+        {
+          "email": "contoso-support@contoso.com",
+          "displayName": "Contoso Support"
+        }
+      ],
+      "disableUserEngagementTracking": true
+    }
+  },
+  "responses": {
+    "202": {
+      "headers": {
+        "Repeatability-Result": "accepted",
+        "Operation-Location": "https://contoso.westus.communications.azure.com//email/status/8540c0de-899f-5cce-acb5-3ec493af3800?api-version=2021-10-01-preview",
+        "Retry-After": 1,
+        "x-ms-request-id": "8540c0de-899f-5cce-acb5-3ec493af3800"
+      }
+    }
+  }
+}
diff --git a/specification/communication/data-plane/Email/readme.csharp.md b/specification/communication/data-plane/Email/readme.csharp.md
new file mode 100644
index 000000000000..2efd3715cdc3
--- /dev/null
+++ b/specification/communication/data-plane/Email/readme.csharp.md
@@ -0,0 +1,15 @@
+## C
+
+These settings apply only when `--csharp` is specified on the command line.
+Please also specify `--csharp-sdks-folder=<path to "SDKs" directory of your azure-sdk-for-net clone>`.
+
+```yaml $(csharp)
+csharp:
+  azure-arm: true
+  license-header: MICROSOFT_MIT_NO_VERSION
+  payload-flattening-threshold: 1
+  clear-output-folder: true
+  client-side-validation: false
+  namespace: Microsoft.CommunicationServices
+  output-folder: $(csharp-sdks-folder)/communicationservices/management/Microsoft.CommunicationServices/GeneratedProtocol
+```
diff --git a/specification/communication/data-plane/Email/readme.md b/specification/communication/data-plane/Email/readme.md
new file mode 100644
index 000000000000..5a081adf4b64
--- /dev/null
+++ b/specification/communication/data-plane/Email/readme.md
@@ -0,0 +1,64 @@
+# communicationservices
+
+> see https://aka.ms/autorest
+
+This is the AutoRest configuration file for communicationservices.
+
+## Getting Started
+
+To build the SDKs for My API, simply install AutoRest via `npm` (`npm install -g autorest`) and then run:
+
+> `autorest readme.md`
+
+To see additional help and options, run:
+
+> `autorest --help`
+
+For other options on installation see [Installing AutoRest](https://aka.ms/autorest/install) on the AutoRest github page.
+
+---
+
+## Configuration
+
+### Basic Information
+
+These are the global settings for the communicationservices.
+
+```yaml
+openapi-type: data-plane
+tag: package-2021-10-01-preview
+```
+
+### Tag: package-2021-10-01-preview
+
+These settings apply only when `--tag=package-2021-10-01-preview` is specified on the command line.
+
+```yaml $(tag) == 'package-2021-10-01-preview'
+input-file:
+  - preview/2021-10-01-preview/CommunicationServicesEmail.json
+title:
+  Azure Communication Services
+```
+
+---
+
+# Code Generation
+
+## Swagger to SDK
+
+This section describes what SDK should be generated by the automatic system.
+This is not used by Autorest itself.
+
+## CSharp
+
+See configuration in [readme.csharp.md](./readme.csharp.md)
+
+## Suppression
+
+``` yaml
+directive:
+  - suppress: DefinitionsPropertiesNamesCamelCase
+    from: CommunicationServicesEmail.json
+    where: $.definitions.EmailRecipients.properties.CC
+    reason: Linter enforcement of this rule (camelCase) for two-letter acronyms conflicts with the description in the rule (all capitalized).
+```