Google Message Security Batch Reference Guide - Manual (Page 353)

Batch Organization Fields 365
Notes
• The nullsender_disposition field’s value takes precedence over Approved/
Blocked Senders, Content Manager or Attachment Manager rules. The NDR
filter runs before the junk filters. Virus blocking processes NDR messages as
usual.
• The nullsender_disposition field’s quarantined and blocked totals appear in
the Traffic reports by domain and by recipient.
• When initially using this field, set the disposition to quarantine. And, during the
period of an NDR storm, change the disposition to blackhole.
• In the case of the nullsender_disposition field, there is no redirect of
quarantine messages to an administrator’s address. The qtine_redir_ndr field
is associated with the ndr field only.
• The nullsender_disposition functionality is used when an NDR message
returns with a null sender value. Some mail servers do not generate NDRs
with a null sender value. For example, Microsoft Exchange, configured for
asynchronous bouncing, generates NDR messages with null sender values.
Other mail servers, such as Postfix, these may not accept email for invalid
addresses. These generate valid NDR messages without a null sender.
• To reduce the amount of invalid NDRs resulting from spam, use a
combination of the nullsender_disposition field, turn on Non-Account
Bouncing, and create custom content filters if your service includes the
Content Manager.
Related Commands
• Input: addorg, modifyorg
• Output: displayorg
Related Fields
• ndr (for Message Security product only)
See Also
The Message Security Administration Guide, “Content Manager”
nullsender_headertag_validation
The nullsender_headertag_validation field holds the number of hours a NDR or
“bounce” message will be accepted by the system for any outbound message
sent with a header containing a digital signature. This functionality is available for
the Message Filtering, Message Security, and Message Discovery products.