Sinch E-mail 365 SMTP Connections - Minimum TLS version 1.2 enforcement

From October 18, 2023, Sinch will not accept Transport Layer Security (TLS) 1.0 or TLS 1.1 versions for incoming SMTP connections to enforce use of TLS 1.2 or higher from 18-Oct-2023. TLS 1.2 provides strong protection for data sent between client and server.

This is applicable to the unsubscribe notifications; if the recipient's ISP (like Gmail, Hotmail, Yahoo, etc.) or email Client (like Microsoft Outlook, Mozilla Thunderbird, Apple Mail, etc.) do not enable/use TLS 1.2 or higher, you will no longer receive unsubscribe notifications from 18-Oct-2023.