About Transport Layer Security (TLS) Peers

TLS peer

Hosted Email Security can apply your specified TLS configuration with this domain during network communications.

Security level

• Opportunistic:

  • Communicates using encryption if the peer supports and elects to use TLS

  • Communicates without encryption if the peer does not support TLS

  • Communicates without encryption if the peer supports TLS but elects not to use TLS

• Mandatory:

  • Communicates using encryption if the peer supports and elects to use TLS

  • Does not communicate if the peer does not support TLS

  • Does not communicate if the peer supports TLS but elects not to use TLS

    Important:

    To ensure messages can be received from the Hosted Email Security MTA, configure your firewall to accept email messages from the following Hosted Email Security IP address / CIDR blocks:

    Europe, the Middle East, Africa

    • 52.48.127.192/26

    • 52.58.62.192/26

    • 52.58.63.0/25

    All other regions

    • 54.219.191.0/25

    • 54.219.188.0/26

    • 54.86.63.64/26

Status

• Enabled: Hosted Email Security applies your specified TLS configuration to the peer

• Disabled: Hosted Email Security does not apply your specified TLS configuration to the peer

  Instead, the "Default" TLS configuration applies.

Default (TLS Peer)

This configuration applies to all domains that meet any of the following criteria:

• Domain is not in the peer list

• Domain is in the peer list, but is not enabled