![]() That might be a good time to review those SMTP connections with this and this Microsoft article. Be sure to check all of you incoming/outgoing SMTP connections. I got confirmation that SMTP also requires TLS1.2, see also this support article. I've changed the title of this post to reflect this change, but the URL should stay the same. I hope everybody has been working towards this important change since the initial announcement at the end of 2017 and this post from early 2018 (!). Note that this enforcement change will take to roll-out to every tenant etc., so you might not see it immediately. You can find it in the Microsoft 365 Message Center message MC218794, which also references this Docs article.įrom Octoonward, Microsoft will gradually enforce TLS1.2 on Office 365 services. Microsoft has set a new date for the deprecation of TLS1.0 and 1.1, after a previous postponement due to the pandemic.
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