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Tom Hughes 6c4192bf82 Add _mta-sts to labels allowed to have an underscore (#617)
Although _mta-sts is normally used with a TXT record it can
also be used with a CNAME record to delegate the authority.

See sections 3.1 and 8.2 of RFC8461 for details.
2020-02-07 14:20:24 -05:00
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