Can I bring my own domains?

Yes, you can bring your domains.
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Just text our 24/7 chat support, and they'll send you instructions on how to connect them to Mailscale.
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Most customers buy domains within Mailscale because we automatically configure them properly (DKIM/DMARC/SPF) for $10-$15/year per domain.
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When setting up 50 email accounts, this will effectively only add $7-$10 a month, and these are your domains in case you want to cancel Mailscale in the future.