n8n-email-send-enhanced

Enhanced n8n EmailSend Node

An enhanced version of the n8n EmailSend node that includes email threading support through inReplyTo and references headers.

Features

• Email Threading Support: Properly handle email conversations with inReplyTo and references headers
• SMTP Protocol: Full SMTP support with authentication
• Attachments: Support for email attachments
• Multiple Recipients: CC and BCC support
• Priority Settings: Set email priority (low, normal, high)
• HTML and Text: Support for both HTML and plain text emails

New Fields

In-Reply-To

• Field Name: inReplyTo
• Type: String
• Description: Message ID of the email this is a reply to
• Example: <[e-mail]>
• Usage: Used by email clients to thread conversations properly

References

• Field Name: references
• Type: String
• Description: Space or comma-separated list of message IDs in the conversation thread
• Example: <[e-mail]> <[e-mail]>
• Usage: Maintains the complete conversation thread for email clients

SMTP Standards Compliance

These fields follow RFC 5322 standards for email threading:

• In-Reply-To: Contains the message ID of the email being replied to
• References: Contains all message IDs in the conversation thread, allowing email clients to properly group related emails

Installation

• Build the project:

  npm run build
  

• Copy the built files to your n8n custom nodes directory

• Restart your n8n instance

Usage

• Add the "Send Email" node to your workflow
• Configure SMTP credentials
• Fill in the basic email fields (from, to, subject, text/html)
• In "Additional Fields":
  • Add inReplyTo with the message ID you're replying to
  • Add references with the conversation thread message IDs
• Execute the workflow

Example

{
  "inReplyTo": "<[e-mail]>",
  "references": "<[e-mail]> <[e-mail]>"
}

This ensures proper email threading in email clients like Gmail, Outlook, and Thunderbird.