Opportunistic TLS Router for IIS SMTP Service

Platform: Windows XP or later (32bit/x64)
IIS SMTP Service installed

Redirect email messages from outbound TLS enabled IIS SMTP Virtual Servers to a Plain TCP IIS SMTP Virtual Server in case of TLS not supported by recipient server.

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How Opportunistic TLS Router works in IIS SMTP Service?

TLS Router checks if the remote server supports TLS before the current SMTP server sends the email to the remote server.

  • If the remote server supports TLS encryption, the current SMTP server to send the email to the remote server directly.
  • If remote server doesn’t support TLS encryption, it will forward the email to the Plain TCP Virtual Server, which in turn will send the email to the remote server using a plain TCP connection.

Enable Opportunistic TLS in IIS SMTP Service - Tutorial

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