User Guide

24-43

AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide

Chapter 24 Configuring Routing and Delivery Features

Controlling Email Delivery Using Destination Controls

• TLS, page 24-43

• Bounce Verification, page 24-43

• Bounce Profile, page 24-43

Rate Limiting

• Concurrent Connections: number of simultaneous connections to remote hosts the appliance will

attempt to open.

• Maximum Messages Per Connection: number of messages your appliance will send to a destination

domain before the appliance initiates a new connection.

• Recipients: number of recipients the appliance will send to a given remote host in a given time

period.

• Limits: how to apply the limits you have specified on a per-destination and per MGA hostname

basis.

TLS

• Whether TLS connections to remote hosts will be accepted, allowed, or required (see Controlling

TLS, page 24-46).

• Whether to send an alert when TLS negotiation fails when delivering a message to a remote host that

requires a TLS connection. This is a global setting, not a per-domain setting.

• Assign a TLS certificate to use for all outbound TLS connections to remote hosts.

Bounce Verification

• Whether or not to perform address tagging via Bounce Verification (see Bounce Verification,

page 24-51).

Bounce Profile

• Which bounce profile should be used by the appliance for a given remote host (the default bounce

profile is set via the Network > Bounce Profiles page).

You can also control the default settings for unspecified domains.