Microsoft's DANE rollout for Exchange Online

[Knubben, Bart]

See also today's blog post "Exchange Online Introduces DANE and DNSSEC for Outbound Email" on https://practical365.com/exchange-online-dnssec-dane/.

> -----Oorspronkelijk bericht-----
> Van: dane-users <dane-users-bounces at sys4.de> Namens Viktor Dukhovni
> Verzonden: vrijdag 7 januari 2022 03:04
> Aan: dane-users at sys4.de
> Onderwerp: Microsoft's DANE rollout for Exchange Online
> 
> 
> Starting this month through May 2022, Microsoft will incrementally
> roll out outbound DANE support (*enabled by default*) for all hosted
> Exchange Online domains:
> 
> 	https://m365admin.handsontek.net/upcoming-release-outbound-smtp-
> dane-and-dnssec-in-microsoft-365-exchange-online/
> 
> > As previously announced in the blog post Support of DANE and DNSSEC in Office
> 365 Exchange Online, we will be adding support for SMTP DANE and DNSSEC to
> Exchange Online (EXO). DANE combined with DNSSEC is the state-of-the-art for
> securing email, and to optimize its effectiveness both standards will be enabled by
> default at the system level for all EXO customers.
> 
> If your cert rollover practices are sloppy, with transient certificate
> chain validation failures after each key/cert rollover, as stale TLSA
> records age out from caches or are only updated after problem reports,
> then this is a good time to either up your game, or stop publishing TLSA
> records.  Having stale TLSA records that delay or break email delivery
> does neither you nor the people sending you email any good.
> 
> Please follow best-practice and pre-publish matching TLSA records for
> the upcoming certs a few TTLs before certificate deployment.  If that's
> too hard, disable DANE until you can implement a more robust rollover
> process.
> 
> --
> 	Viktor.
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