Generally, customizing DNS settings is not possible with Mailscale email accounts, as our service is specifically optimized for email deliverability. This includes adding DKIM, DMARC, SPF, and all necessary records to ensure proper inbox placement.

However, if you provide us with more context about your use case and what you need added, we can try to facilitate this as a custom request. Please note that this process might take 48 to 72 hours, as it is a manual request.