I use "qpopper"  in conjunction with "qmail" as a mail server.
Look for those in google.com
Juan Carlos
                                                                                            
                    "Patrick                                                                
                    Grantham"            To:     <slug@nks.net>                             
                    <pwgrant@yahoo       cc:                                                
                    .com>                Subject:     [SLUG] mail server.                   
                    Sent by:                                                                
                    slug@lists.nks                                                          
                    .net                                                                    
                                                                                            
                                                                                            
                    11/16/01 01:32                                                          
                    AM                                                                      
                    Please respond                                                          
                    to slug                                                                 
                                                                                            
                                                                                            
which service is used so that my linux box can BE a pop server?
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