Hi,
SophosUTM can't be detected when spam mail is sent from the client added to Host-based relay.
Of course, it will be quarantined if the same mail is sent from the client which is not in Host-based relay.
2013:04:23-17:43:02 foo-1 exim-in[4564]: 2013-04-23 17:43:02 SMTP connection from [192.168.0.11]:2577 (TCP/IP connection count = 1)
2013:04:23-17:43:33 foo-1 exim-in[8641]: 2013-04-23 17:43:33 [192.168.0.11] F= R= Accepted: from relay
2013:04:23-17:43:49 foo-1 exim-in[8641]: 2013-04-23 17:43:49 1UUYp5-0002FN-0K work R=SCANNER T=SCANNER
2013:04:23-17:44:05 foo-1 smtpd[8733]: SCANNER[8733]: 1UUYp5-0002FN-0K Completed
2013:04:23-17:45:39 foo-1 exim-in[4564]: 2013-04-23 17:45:39 SMTP connection from [192.168.0.11]:2617 (TCP/IP connection count = 1)
2013:04:23-17:46:00 foo-1 exim-out[9524]: 2013-04-23 17:46:00 Start queue run: pid=9524
2013:04:23-17:46:00 foo-1 exim-out[9524]: 2013-04-23 17:46:00 End queue run: pid=9524
2013:04:23-17:46:23 foo-1 exim-in[9433]: 2013-04-23 17:46:23 H=(foo) [192.168.0.11]:2617 Warning: yyyyyy.yyy profile excludes greylisting: Skipping greylisting for this message
2013:04:23-17:46:23 foo-1 exim-in[9433]: 2013-04-23 17:46:23 H=(foo) [192.168.0.11]:2617 Warning: yyyyyy.yyy profile excludes AV scan: Skipping SMTP inline AV scan for this message
2013:04:23-17:46:25 foo-1 exim-in[9433]: 2013-04-23 17:46:25 [192.168.0.11] F= R= Verifying recipient address with callout
2013:04:23-17:46:31 foo-1 exim-in[9433]: 2013-04-23 17:46:31 1UUYrr-0002S9-1L ctasd reports 'Confirmed' RefID:str=0001.0A150209.51764A67.010F,ss=4,re=0.000,recu=0.000,reip=0.000,cl=4,cld=1,fgs=0
2013:04:23-17:46:31 foo-1 exim-in[9433]: 2013-04-23 17:46:31 1UUYrr-0002S9-1L work R=SCANNER T=SCANNER
2013:04:23-17:46:40 foo-1 smtpd[9603]: SCANNER[9603]: 1UUYrr-0002S9-1L Completed
2013:04:23-17:43:02 foo-1 exim-in[4564]: 2013-04-23 17:43:02 SMTP connection from [192.168.0.11]:2577 (TCP/IP connection count = 1)
2013:04:23-17:43:33 foo-1 exim-in[8641]: 2013-04-23 17:43:33 [192.168.0.11] F= R= Accepted: from relay
2013:04:23-17:43:49 foo-1 exim-in[8641]: 2013-04-23 17:43:49 1UUYp5-0002FN-0K work R=SCANNER T=SCANNER
2013:04:23-17:44:05 foo-1 smtpd[8733]: SCANNER[8733]: 1UUYp5-0002FN-0K Completed
2013:04:23-17:45:39 foo-1 exim-in[4564]: 2013-04-23 17:45:39 SMTP connection from [192.168.0.11]:2617 (TCP/IP connection count = 1)
2013:04:23-17:46:00 foo-1 exim-out[9524]: 2013-04-23 17:46:00 Start queue run: pid=9524
2013:04:23-17:46:00 foo-1 exim-out[9524]: 2013-04-23 17:46:00 End queue run: pid=9524
2013:04:23-17:46:23 foo-1 exim-in[9433]: 2013-04-23 17:46:23 H=(foo) [192.168.0.11]:2617 Warning: yyyyyy.yyy profile excludes greylisting: Skipping greylisting for this message
2013:04:23-17:46:23 foo-1 exim-in[9433]: 2013-04-23 17:46:23 H=(foo) [192.168.0.11]:2617 Warning: yyyyyy.yyy profile excludes AV scan: Skipping SMTP inline AV scan for this message
2013:04:23-17:46:25 foo-1 exim-in[9433]: 2013-04-23 17:46:25 [192.168.0.11] F= R= Verifying recipient address with callout
2013:04:23-17:46:31 foo-1 exim-in[9433]: 2013-04-23 17:46:31 1UUYrr-0002S9-1L ctasd reports 'Confirmed' RefID:str=0001.0A150209.51764A67.010F,ss=4,re=0.000,recu=0.000,reip=0.000,cl=4,cld=1,fgs=0
2013:04:23-17:46:31 foo-1 exim-in[9433]: 2013-04-23 17:46:31 1UUYrr-0002S9-1L work R=SCANNER T=SCANNER
2013:04:23-17:46:40 foo-1 smtpd[9603]: SCANNER[9603]: 1UUYrr-0002S9-1L Completed