diff --git a/docs/integrations/builtin/core-nodes/n8n-nodes-base.sendemail.md b/docs/integrations/builtin/core-nodes/n8n-nodes-base.sendemail.md index ff8054328f..3104568c98 100644 --- a/docs/integrations/builtin/core-nodes/n8n-nodes-base.sendemail.md +++ b/docs/integrations/builtin/core-nodes/n8n-nodes-base.sendemail.md @@ -141,6 +141,12 @@ The following options are also available: * **Limit Wait Time**: Whether the workflow will automatically resume execution after a specified time limit. This can be an interval or a specific wall time. * **Append n8n Attribution**: Set whether to include the phrase `This email was sent automatically with n8n` at the end of the email (turned on) or not (turned off). +### Limitation + +The Send Email (SMTP) node does not support setting headers like In-Reply-To and References, which are required for email threading. As a result, each email is treated as a new conversation instead of appearing in the same thread. + +* **Workaround**: Use the Gmail node’s Reply operation or a custom node (e.g., n8n-nodes-better-send-mail) that supports custom headers. + ## Templates and examples