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Add _mta-sts to labels allowed to have an underscore (#617)

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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.
This commit is contained in:
Tom Hughes
2020-02-07 19:20:24 +00:00
committed by GitHub
parent 450accf0a5
commit 6c4192bf82
1 changed files with 1 additions and 0 deletions
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pkg/normalize/validate.go
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@ -92,6 +92,7 @@ var labelUnderscores = []string{
"_dmarc", "_dmarc",
"_domainkey", "_domainkey",
"_jabber", "_jabber",
"_mta-sts",
"_sip", "_sip",
"_xmpp", "_xmpp",
} }