Sets the maximum number of simultaneous SMTP authentication connections. The default is 2,000 connections.
Maximum number of connections from a single IPv4 address or IPv6 range
Sets the maximum number of simultaneous SMTP authentication connections that can be made from a single IPv4 address or IPv6 range.
The default value is 20 connections.
IPv6 CIDR prefix for maximum number of connections from a single IPv6 range
Describes the CIDR prefix to be used if an IPv6 range is used.
The prefix value must be an integer from 0 to 128. The default value is 64.
Maximum number of connections from a single IP address
Sets the maximum number of simultaneous SMTP authentication connections that can be made from a single IP address. The default is 20 connections.
Maximum message size in bytes
Sets the maximum size allowable for a message before it is rejected. The default is 10,485,760 bytes.
Maximum number of recipients per message
Indicates the maximum number of recipients permitted to receive a message. The default is 1,024 recipients.
Maximum number of messages per session
Indicates the maximum number of email messages that are permitted in a single session.
The default value is 100.
Insert RECEIVED header
Places a RECEIVED header in the message during outbound processing of messages sent using SMTP authentication when checked. When unchecked, no RECEIVED header is inserted during outbound SMTP processing. If this option and Strip pre-existing RECEIVED headers are both checked, the outbound SMTP RECEIVED header remains when the message goes to the delivery queue.
Strip RECEIVED headers
Removes all RECEIVED headers for outbound messages sent using SMTP authentication 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 both Insert RECEIVED header and Strip pre-existing RECEIVED headers are checked.
Enabling this setting can reduce you ability to diagnose message flow issues.
Enable reverse DNS lookup
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 sent using SMTP authentication.
When you enable the global rDNS settings on Protocols > SMTP > Settings page, you override this local setting.
Enable optional SASL plain support
By default, Symantec Messaging Gateway uses SASL login authentication. You can choose to also enable SASL plain authentication.