Google Message Security for Google Apps Administration Guide - Manual (Page 18)

18 Message Security for Google Apps Administration Guide
Activity Information Meaning
Valid messages Total count of valid messages that were
passed on to Gmail.
Spam Total count of messages quarantined as spam.
This is separate from Gmail spam filtering.
Viruses Total count of messages quarantined as
viruses. This is separate from Gmail virus
filtering.
500 Errors Total count of messages rejected with 500
errors.
A 500-series error is a standard email code
(with an error number between 500 and 599)
that indicates a mail message has been
rejected. This could happen for many reasons,
including Content Manager rules, invalid
recipients, or blatant spam bouncing.
400 Errors Total count of messages deferred with 400
errors.
A 400-series error is a standard email code
(with an error number between 400 and 499)
that indicates a mail message has been
deferred and that the sending server should try
again later. This may happen due to a server
error, special spam filtering deferrals, or a
temporary error.
Avg Message Size The average size of messages sent through
the service.
Total Bytes The total size of all message sent through the
service.
Msgs Blocked The number of messages that have been
blocked or bounced by the service.