diff --git a/src/common/interfaces/email-api-options.interface.ts b/src/common/interfaces/email-api-options.interface.ts
index 606e30c8..048068d1 100644
--- a/src/common/interfaces/email-api-options.interface.ts
+++ b/src/common/interfaces/email-api-options.interface.ts
@@ -5,7 +5,7 @@ export interface EmailApiAttachment {
   filename?: string | false | undefined;
   path?: string;
   content_type?: string;
-  inline_content_id?: string;
+  content_id?: string;
 }
 
 export interface EmailApiOptions {
diff --git a/src/common/utils/parse-email-to-api-options.ts b/src/common/utils/parse-email-to-api-options.ts
index 3a9e4560..e7b2ae6c 100644
--- a/src/common/utils/parse-email-to-api-options.ts
+++ b/src/common/utils/parse-email-to-api-options.ts
@@ -12,7 +12,7 @@ function parseAttachments(
     filename: attachment.filename,
     path: attachment.path,
     content_type: attachment.contentType,
-    inline_content_id: attachment.inlineContentId,
+    content_id: attachment.contentId,
   }));
 }
 
diff --git a/src/emails/interfaces/create-email-options.interface.ts b/src/emails/interfaces/create-email-options.interface.ts
index 3aa38766..11db678a 100644
--- a/src/emails/interfaces/create-email-options.interface.ts
+++ b/src/emails/interfaces/create-email-options.interface.ts
@@ -124,7 +124,7 @@ export interface Attachment {
    * Optional content ID for the attachment, to be used as a reference in the HTML content.
    * If set, this attachment will be sent as an inline attachment and you can reference it in the HTML content using the `cid:` prefix.
    */
-  inlineContentId?: string;
+  contentId?: string;
 }
 
 export type Tag = {