SpamAssassin

Installation

yum install spamassassin  
service spamassassin start  
chkconfig spamassassin on

Testing

Send youself a plaintext message with this
body:

XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X

Here’s what you should see

amavis[14510]: (14510-01) Passed SPAM {RelayedTaggedInbound,Quarantined},   
[209.85.216.169]:50991 [209.85.216.169] <ping@example.com> -> <pong@example.com>,   
quarantine: spam-d02pBmtMd5Y9.gz, Message-ID: <CAM=+e3GQNZPRiOXSZNFO8n6cVnbG5gGKT=NaWBM-CE3ciwomBw@mail.example.com>,   
mail_id: d02pBmtMd5Y9, Hits: 999.201, size: 1953, queued_as: 8D8297429, dkim_sd=20120113:example.com, 384 ms