Configure SMTP connection settings for the
MTA from the Connection settings screen.
Procedure
Go to Administration → IMSS Configuration → SMTP Routing.
Click the Connections tab.
The Connections screen appears.
Specify the SMTP Interface settings.
IP address: Select the interface that will connect
with your SMTP server.
Loopback address
The SMTP server will only listen to the IP address on the local
computer.
All interfaces
If there are multiple IP addresses on the computer, the SMTP
server will listen to any of the IP addresses available.
Port: Specify the listening port of the SMTP server.
Disconnect after { } minutes of
inactivity: Specify a time-out value.
Simultaneous connections: Click No
limit or Allow up to { }
connections and specify the maximum number of
connections.
Specify the Connection Control settings.
Select Accept all, except the following list to
configure the "deny list" or Deny all, except the following
list to configure the "permit list”.
Configure the list.
Single computer: Specify an IP address and then click
>> to add it to the list.
Group of computers:
Select the IP version.
For IPv4 addresses, specify a
subnet address and mask.
For IPv6 addresses, specify a
subnet address.
Click >> to
add the group to the list.
Import from file: Click to import an IP list from a
file. The following shows sample content of an IP list text
file:
192.168.1.1
192.168.2.0:255.255.255.0
192.168.3.1:255.255.255.128
192.168.4.100
192.168.5.32:255.255.255.192
2001:db8:10ff::ae:44f2
2001:db8::/32
Specify the
Transport Layer Security settings.
Select Enable Incoming Transport Layer
Security.
This option enables the IMSS SMTP Server to accept
messages only through a TLS connection.
Select Only accept SMTP connection by
TLS for IMSS to
accept only secure incoming connections.
This option enables the IMSS SMTP Server to accept
messages only through a TLS connection.
Click a Browse button next
to one of the following:
CA certificate: A CA
certificate is usually used for verifying SMTP clients.
However, IMSS does not
verify the client and only uses the CA certificate for
enabling the TLS connection.
Only upload this file if it is provided to
you together with the public key. Otherwise, this file is
not mandatory for enabling a TLS connection.
Private key: The
SMTP client encrypts a random number using IMSS SMTP server's
public key and an encryption key to generate the session
keys.
IMSS
SMTP server then uses the private key to decrypt the random
number in order to establish the secure connection. This key
must be uploaded to enable a TLS connection.
SMTP server certification:
The IMSS
SMTP server's public key made available to the SMTP clients
for generating the session keys.
This key must be uploaded to enable a TLS
connection.
Click Upload to save the
file to the IMSS server.
Select Enable Outgoing Transport Layer
Security to protect outbound messages, if desired.
