diff --git a/content/docs/tech-resources/extended-error-codes.md b/content/docs/tech-resources/extended-error-codes.md
index c5b0d53f..81943217 100644
--- a/content/docs/tech-resources/extended-error-codes.md
+++ b/content/docs/tech-resources/extended-error-codes.md
@@ -55,6 +55,7 @@ The following table is a complete list of extended error code responses, organiz
 |                       | 2005        | No published version of template exists          | 422              |                                              |
 |                       | 2006        | Transmission record in invalid state             | 409              |                                              |
 |                       | 2007        | Metadata size too large                          | 422              |                                              |
+|                       | 2008        | No local part specified in sender address        | 400              | check if provided email is correct           |
 |                       | 2101        | Exceed Sending Limit (hourly)                    | 420              |                                              |
 |                       | 2102        | Exceed Sending Limit (daily)                     | 420              |                                              |
 |                       | 2103        | Exceed Sending Limit (sandbox)                   | 420              |                                              |