Additional SMTP settings are available from the SMTP Defaults page of the SMTP tab when you click the Advanced Settings button at the bottom of the Edit Host Configuration page. There are advanced SMTP settings for:
■ Inbound messages
■ Outbound messages
■ Delivering messages
Specify the MTA host name in the MTA Configuration portion of the SMTP Defaults page. The MTA Host Name gives you the ability to define the HELO banner during the initial portion of the SMTP conversation.
SMTP Defaults page–inbound settings describes inbound SMTP settings you can use to further define your SMTP configuration.
Table 2-1 SMTP Defaults page—inbound settings
Description Item
Sets the maximum number of simultaneous inbound connections allowed. Additional attempted connections are rejected. The default is 2,000 connections.
Maximum number of connections
(Not available on Windows systems.) Sets the maximum number of simultaneous inbound connections allowed from a single IP address. Additional connections for the same IP address will be rejected. The default is 20. Maximum number of
connections from a single IP address
Sets the maximum size of a message before it is rejected. The default is 10,485,760 bytes.
Maximum message size in bytes
Sets the maximum number of recipients for a message. The default is 1,024 recipients.
Maximum number of recipients per message
Places a RECEIVED header in the message during inbound SMTP processing.
Insert RECEIVED header to inbound messages
Causes the system to perform reverse DNS lookup on the SMTP client IP addresses to resolve the IP address to a name when checked. This is the default condition. When unchecked, reverse DNS lookup is not performed for inbound messages.
Enable reverse DNS lookup
SMTP Defaults page–outbound settings describes the advanced outbound SMTP settings that you can use to further define your SMTP configuration.
31 Configuring system settings Configuring host (Scanner) settings
Table 2-2 SMTP Defaults page—outbound settings
Description Item
Sets the maximum number of permissible simultaneous outbound connections. Additional attempted connections are rejected. The default is 2,000 connections.
Maximum number of connections
(Not available on Windows systems.) Sets the maximum number of permissible simultaneous outbound connections from a single IP address. Additional attempted connections are rejected. The default is 20 connections.
Maximum number of connections from a single IP address
Sets the maximum number of permissible simultaneous outbound connections from a single IP address. Additional attempted connections are rejected. The default is 20 connections.
Maximum number of connections from a single IP address
Sets the maximum size allowable for a message before it is rejected. The default is 10,485,760 bytes.
Maximum message size in bytes
Indicates the maximum number of recipients permitted for a message. The default is 1,024 recipients.
Maximum number of recipients per message
Sets a default domain when none can be found in the message. Default domain for sender
addresses with no domain
Places a RECEIVED header in the message during outbound SMTP processing when checked. When unchecked, no RECEIVED header is inserted during outbound SMTP processing. If Insert RECEIVED header to outbound messages and Strip pre-existing RECEIVED headers from outbound messages are both checked, the outbound SMTP RECEIVED header remains when the message goes to the delivery queue. Insert RECEIVED header
to outbound messages
Removes all RECEIVED headers for the message when checked. When headers are stripped, message looping can occur depending on the settings of other MTAs. When unchecked, RECEIVED headers remain in the message during outbound processing. The RECEIVED header for outbound SMTP processing remains in the message when Insert RECEIVED header to outbound messages and Strip pre-existing RECEIVED headers from outbound messages are checked.
Strip pre-existing RECEIVED headers from outbound messages
Causes the system to perform reverse DNS lookup on the SMTP client IP addresses to resolve the IP address to a name when checked. This is the default condition. When unchecked, reverse DNS lookup is not performed for outbound messages. Enable reverse DNS
lookup Configuring system settings Configuring host (Scanner) settings 32
SMTP Defaults page–delivery settings describes SMTP delivery configuration message settings for your site.
Table 2-3 SMTP Defaults page—delivery settings
Description Item
Sets the maximum number of simultaneously allowed external connections. Additional attempted connections are rejected. The default is 100 connections.
Maximum number of external connections
Sets the maximum number of connections allowed to all defined internal mail servers. Additional connection attempts are rejected. The default is 100 internal mail server connections. Maximum number of
connections to all internal mail servers
Sets the maximum number of connections to one internal mail server. Additional connection attempts are rejected. The default is 50 connections.
Maximum number of connections per single internal mail server
Sets the smallest interval the SMTP server waits before trying to deliver a message again. The default is 15 minutes. Minimum retry interval
Sets the time after which an undelivered message times out and is rejected from the queue. The default is 5 days. Sent message time-out
(Unix/Linux only) Sets a time-out period for deletion of messages in your bounce queue. This can be particularly useful in environments where you cannot configure LDAP settings. The default is 1 day.
Bounce message time-out
Sets the time a message waits in the mail queue before notification of nondelivery is sent. The default is 4 hours. Message delay time in
queue before notification
(Unix/Linux only) Reverses the default delivery MTA interface bindings. Check this box if messages back up in the delivery queue due to routing issues.
Reverse Address Binding Strategy
33 Configuring system settings Configuring host (Scanner) settings
Table 2-3 SMTP Defaults page—delivery settings (continued)
Description Item
For Unix/Linux installations, indicates if TLS encrypted information can be accepted. Check the box to accept encrypted information. Whenleft unchecked, TLS encryption is not performed.
On Windows installations, indicates which domains require information to be encrypted. Add or delete domains from which you require encryption.
Note:You must have created an MTA TLS certificate from the Certicate Setting page in Settings > Certificates before you can enable TLS encryption.
See“Configuring certificate settings ”on page 23. Enable TLS encryption
(Unix/Linux)
Require TLS encryption for the following hosts (Windows)
(Windows only) Adds the names of domains from which you may require encryption. Check the names of those domains from which information must currently be encrypted. Leave unchecked to currently except listed domains from this requirement. Press Delete to remove selected domains from the list.
Domains
To configure SMTP Default settings
1
From the Control Center, click Settings > Hosts.2
Select a Scanner from the displayed list.3
Click Edit.4
Click the SMTP tab.On this tab, you will see some general-purpose settings.
See“SMTP Scanner settings”on page 27. for details on these settings.
5
Click Advanced Settings.On this page you will see the advanced settings for SMTP configuration detailed in the above tables.
6
As appropriate, modify the settings explained above.7
Click Continue to store your information.You are returned to the SMTP tab of the Edit Host Configuration page.
8
Click Save.Configuring system settings Configuring host (Scanner) settings 34