> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mailofly.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Reply to Emails

> Send conversational replies to inbound email threads with header threading.

# Reply to Inbound Emails

When receiving an email through webhooks, you can easily reply to the sender while preserving conversation threading in the recipient's mail client.

## Preserving Threading

To ensure the reply appears in the same email thread:

1. Extract the `Message-ID` from the incoming email's headers.
2. When calling `mailofly.emails.send()`, pass `headers`:
   * `In-Reply-To`: Set to the incoming `Message-ID`.
   * `References`: Set to the incoming `References` plus the incoming `Message-ID`.
   * `Subject`: Prefix with `Re: ` (if not already present).


## Related topics

- [Email Content](/receiving/email-content.md)
- [Custom Domains](/receiving/custom-domains.md)
- [Introduction](/receiving/introduction.md)