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You set up wildcard MX records, such as for *.yourdomain.tld. With Fastmail sets this up automatically if you let them handle your DNS, though you can (obvious
by danieldk 8y ago
You set up wildcard MX records, such as for *.yourdomain.tld.
With Fastmail sets this up automatically if you let them handle your DNS, though you can (obviously) disable it.