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Add DANE support for Microsoft 365/office365.com - #214
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Add DNSSEC-enabled Microsoft 365 mail host to office365.com XML file. Sources: https://techcommunity.microsoft.com/blog/exchange/modernizing-dns-security-for-exchange-online-mail-flow/4514248 https://learn.microsoft.com/en-us/exchange/security-and-compliance/how-dane-secures-email
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Added a comment to clear up what the hostname would actually look like. As far as I understood the fetchConfigForMX() in mail/components/accountcreation/modules/FetchConfig.sys.mjs Thunderbird "reduces" the hostname down the the actually registered domain (in this case mx.microsoft), so mx.microsoft in the XML should be enough. |
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October 22, 2026 13:12
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Add DNSSEC-enabled/DANE Microsoft 365 mail host to office365.com XML file.
Sources:
https://techcommunity.microsoft.com/blog/exchange/modernizing-dns-security-for-exchange-online-mail-flow/4514248 https://learn.microsoft.com/en-us/exchange/security-and-compliance/how-dane-secures-email
This is done with regards to an issue I am experiencing in Nextcloud Mail which uses ISPDB if it cannot determine the configuration automatically. (Exchange integrated via OAuth in Nextcloud Mail)
As far as my understanging of the spec goes the new URL in it's current form in the XML should be enough to be recognized if the actual domain is
contosotest-com.o-v1.mx.microsoft.