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Minimum TLS version 1.2 enforcement from October 18, 2023

Community Manager
Community Manager

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.

Shahzad Ismail
Head of Knowledge Management and Community Engagement, Sinch