Thanks for the pointers Smeghead,
My messages log has this....
Jul 12 07:57:35 mailserver HORDE[2112]: [imp] Logout for paul@dunns-ls.co.uk [80.168.134.157] from {localhost:143} [on line 34 of "/home/httpd/html/horde/imp/login.php"]
Jul 12 08:00:00 mailserver su(pam_unix)[749]: session opened for user qmailr by (uid=0)
Jul 12 08:00:03 mailserver last message repeated 8 times
Jul 12 08:03:19 mailserver HORDE[2121]: [imp] Login success for paul@dunns-ls.co.uk [80.168.134.157] to {localhost:143} [on line 83 of "/home/httpd/html/horde/imp/redirect.php"]
Jul 12 08:05:00 mailserver su(pam_unix)[1097]: session opened for user qmailr by (uid=0)
Jul 12 08:05:01 mailserver su(pam_unix)[1097]: session closed for user qmailr
Jul 12 08:05:09 mailserver last message repeated 8 times
Jul 12 08:05:16 mailserver su(pam_unix)[749]: session closed for user qmailr
and this is my maillog...
Jul 12 08:15:37 mailserver spamd[1414]: server hit by SIGCHLD 
Jul 12 08:15:37 mailserver spamd[1414]: handled cleanup of child pid 12428 
Jul 12 08:15:37 mailserver spamd[1414]: server successfully spawned child process, pid 1677 
Jul 12 08:15:47 mailserver spamd[17935]: connection from localhost [127.0.0.1] at port 41606 
Jul 12 08:15:47 mailserver spamd[17935]: info: setuid to qmailq succeeded 
Jul 12 08:15:47 mailserver spamd[17935]: processing message <110571DA1FEBD711A84500D0B7654D8C03A35F70@gds_ser_01> for qmailq:404. 
Jul 12 08:15:53 mailserver spamd[17935]: clean message (-0.8/2.0) for qmailq:404 in 6.3 seconds, 4210 bytes. 
Jul 12 08:15:53 mailserver spamd[17935]: result: .  0 - AWL,BAYES_00,RAZOR2_CF_RANGE_51_100,RAZOR2_CHECK scantime=6.3,size=4210,mid=<110571DA1FEBD711A84500D0B7654D8C03A35F70@gds_ser_01>,bayes=0,autolearn=no 
Jul 12 08:16:05 mailserver spamd[14321]: connection from localhost [127.0.0.1] at port 41609 
Jul 12 08:16:05 mailserver spamd[14321]: info: setuid to qmailq succeeded 
Jul 12 08:16:05 mailserver spamd[14321]: processing message <0IJE00CBXUVPIV00@l-daemon> for qmailq:404. 
Jul 12 08:16:13 mailserver spamd[14321]: clean message (0.6/2.0) for qmailq:404 in 8.0 seconds, 9199 bytes. 
Jul 12 08:16:13 mailserver spamd[14321]: result: .  0 - AWL,BAYES_00,DOMAIN_4U2,RAZOR2_CF_RANGE_51_100,RAZOR2_CHECK scantime=8.0,size=9199,mid=<0IJE00CBXUVPIV00@l-daemon>,bayes=1.66533453693773e-16,autolearn=no 
Jul 12 08:16:25 mailserver spamd[31194]: connection from localhost [127.0.0.1] at port 41612 
Jul 12 08:16:25 mailserver spamd[31194]: info: setuid to qmailq succeeded 
Jul 12 08:16:25 mailserver spamd[31194]: processing message <2tG5TrvfF00009842@swiss.nwswissmatic.local> for qmailq:404. 
Jul 12 08:16:31 mailserver spamd[31194]: clean message (-1.0/2.0) for qmailq:404 in 6.1 seconds, 4124 bytes. 
Jul 12 08:16:31 mailserver spamd[31194]: result: . -1 - AWL,BAYES_00,NO_REAL_NAME,RAZOR2_CF_RANGE_51_100,RAZOR2_CHECK scantime=6.1,size=4124,mid=<2tG5TrvfF00009842@swiss.nwswissmatic.local>,bayes=4.9960036108132e-16,autolearn=no 
Jul 12 08:16:42 mailserver spamd[27486]: connection from localhost [127.0.0.1] at port 41615 
Jul 12 08:16:42 mailserver spamd[27486]: info: setuid to qmailq succeeded 
Jul 12 08:16:43 mailserver spamd[27486]: processing message <0IJE008G4V1PT200@msg-mx1.usc.edu> for qmailq:404. 
Jul 12 08:16:49 mailserver spamd[27486]: clean message (1.5/2.0) for qmailq:404 in 6.9 seconds, 4314 bytes. 
Jul 12 08:16:49 mailserver spamd[27486]: result: .  1 - AMATEUR_PORN,AWL,BAYES_00,RAZOR2_CF_RANGE_51_100,RAZOR2_CHECK,WHY_WAIT scantime=6.9,size=4314,mid=<0IJE008G4V1PT200@msg-mx1.usc.edu>,bayes=1.32782673745169e-13,autolearn=no 
Jul 12 08:17:00 mailserver spamd[1677]: connection from localhost [127.0.0.1] at port 41618 
Jul 12 08:17:02 mailserver spamd[1677]: info: setuid to qmailq succeeded 
Jul 12 08:17:05 mailserver spamd[1677]: processing message <gJKVApwOL00001ccf@mail.outreachseniorhealthcare.com> for qmailq:404. 
Jul 12 08:17:13 mailserver spamd[1677]: identified spam (4.2/2.0) for qmailq:404 in 12.3 seconds, 3657 bytes. 
Jul 12 08:17:13 mailserver spamd[1677]: result: Y  4 - AWL,BAYES_50,DRUGS_ERECTILE,MORE_SEX,NO_REAL_NAME,RAZOR2_CF_RANGE_51_100,RAZOR2_CHECK scantime=12.3,size=3657,mid=<gJKVApwOL00001ccf@mail.outreachseniorhealthcare.com>,bayes=0.499775773982387,autolearn=no 
Jul 12 08:17:24 mailserver spamd[17935]: connection from localhost [127.0.0.1] at port 41621 
Jul 12 08:17:24 mailserver spamd[17935]: info: setuid to qmailq succeeded 
Jul 12 08:17:24 mailserver spamd[17935]: processing message <200507101212.j6ACCCP25302@userone.serve.co.uk> for qmailq:404. 
Jul 12 08:17:31 mailserver spamd[17935]: clean message (0.7/2.0) for qmailq:404 in 7.2 seconds, 3200 bytes. 
Jul 12 08:17:31 mailserver spamd[17935]: result: .  0 - AWL,BAYES_00,MSGID_FROM_MTA_HEADER,MSGID_FROM_MTA_ID,NO_REAL_NAME,RAZOR2_CF_RANGE_51_100,RAZOR2_CHECK scantime=7.2,size=3200,mid=<200507101212.j6ACCCP25302@userone.serve.co.uk>,bayes=3.33066907387547e-16,autolearn=no 
 Refresh this logfile 
Does this mean my spam filter is being over zelous? I cant really see anything wrong in these that point to anything and to me it actually looks like it is receiving the emails! It's just that there not getting into the users mailboxes...
Any help is very much appreciated.
Thanks
Jason