Link to Mailchannels documentation about Domain Lockdown DNS record

content/pages/platform/functions/plugins/mailchannels.md

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 The MailChannels Pages Plugin intercepts all form submissions made which have the `data-static-form-name` attribute set. Then, it emails these form submissions using the MailChannels API.
 
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+To use the Mailchannels Pages Plugin, you must first add a [Domain Lockdown DNS record](https://support.mailchannels.com/hc/en-us/articles/16918954360845-Secure-your-domain-name-against-spoofing-with-Domain-Lockdown-) to the domain you are sending email from. For more information, refer to the [Mailchannels documentation](https://support.mailchannels.com/hc/en-us/articles/4565898358413-Sending-Email-from-Cloudflare-Workers-using-MailChannels-Send-API).
+{{</Aside>}}
+
 ## Installation
 
 ```sh