Google Message Security for Google Apps Administration Guide - Manual (Page 255)

Chapter 12
Approved and Blocked Sender Lists 255
Approved and Blocked Sender Lists
Chapter 12
About Sender Lists
You can approve or block specific senders and recipients, based on the email
address or domain.
The message security service detects spam by applying hundreds of rules to each
message that passes through. It blocks obvious spam outright, and diverts what is
possibly spam to the Quarantine. If you discover that some quarantined
messages are actually good mail that just look like spam, add the senders of
those messages to an appropriate approved-senders list. If a number of
quarantined senders are from the same domain, such as the same company, add
the domain to an appropriate approved-senders list. Messages from those
senders are then delivered to user’s in your organization, regardless of the spam-
like content.
To avoid the risk of increasing spam traffic, approve only specific senders whose
messages might look like spam, rather than approving all of your known senders.
Also, avoid approving too many domains, as that can increase the risk of
spoofing. For more information see “Deciding Which Approved Senders to Add”
on page 263“.
Administrators configure sender lists at the org level and user level in the
Administration Console.
Users configure their personal sender lists in the Message Center.
At the org level in the Administration Console you can configure:
• Approved Senders (individual email addresses and entire domains)
• Blocked Senders (individual email addresses and entire domains)
At the user level in the Administration Console, you can configure:
• Approved Senders (individual email addresses and entire domains)
• Blocked Senders (individual email addresses and entire domains)
• Approved Recipients (individual email addresses and entire domains)