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New submission error speedbump to be introduced During the long effort to deprecate the legacy TLS versions, we have documented how to identify mailboxes that are still using them here: Investigating TLS usage for SMTP in Exchange Online.įor customers who would like to force the use of TLS1.2 early, they can do so by setting the AllowLegacyTLSClients parameter to False. While the change to stop support for TLS1.0 and TLS1.1 for the regular endpoint () will happen in 2022, we’re giving our customers advanced notice to start configuring clients that they have not been able to upgrade or update to use TLS1.2. Customers who use Microsoft 365 operated by 21Vianet need to configure their clients to use. Legacy clients and devices will need to be configured to submit using the new endpoint.Set the AllowLegacyTLSClients parameter on the Set-TransportConfig cmdlet to True.To take advantage of this new endpoint, admins will have to: Customers in US Government clouds have higher security standards and will not be able to opt-in to use older versions of TLS. This way, an organization is secured with TLS1.2 unless they specifically decide to opt for a less secure posture Note that only WW customers will be able to use this new endpoint. However, due to significant usage, we’ve created an opt-in endpoint that legacy clients can use with TLS1.0 and TLS1.1.

In 2022, we plan to disable those older TLS versions to secure our customers and meet compliance requirements. However, we have warned our customers that we can disable them at any time without further warning. While no longer supported, our servers still allow clients to use those older versions of TLS when connecting with Exchange Online. A balance is needed in a shared service that hosts the emails of local bakeries as well as many countries’ governments. We know that the push to meet our security and compliance requirements has made it difficult to support legacy clients and devices that use our service. If you have clients that can’t use TLS1.2, they should be configured to use the opt-in legacy endpoint by now.Įxchange Online ended support for TLS1.0 and TLS1.1 in October 2020.

Update (Feb 2022): We have started to disable TLS1.0 and TLS1.1 for the default SMTP AUTH endpoints. We will be disabling TLS 1.0 and TLS 1.1 usage with SMTP, starting by rejecting a portion of SMTP AUTH submissions using TLS1.0 or TLS1.1 and leading up to a 100% disablement. Update (April 2023): For Microsoft 365 operated by 21Vianet, TLS1.0 and TLS1.1 for SMTP AUTH will no longer be supported after June 30, 2023.

Blank And Secure 7.66 instal the new for windows