thanks for your response Marcmac,
/var/log/maillog has nothing beyond a few sendmail entries before it was killed yesterday as part of the zimbra installation.
Looks like CLAMAV has failed to start:
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) ClamAV-clamd: Connecting to socket 127.0.0.1:3310, retry #2
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) ClamAV-clamd av-scanner FAILED: Too many retries to talk to 127.0.0.1:3
310 (Can't connect to INET socket 127.0.0.1:3310: Connection refused) at (eval 40) line 264.
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) WARN: all primary virus scanners failed, considering backups
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) TROUBLE in check_mail: virus_scan FAILED: virus_scan: ALL VIRUS SCANNER
S FAILED: ClamAV-clamd av-scanner FAILED: Too many retries to talk to 127.0.0.1:3310 (Can't connect to INET socket 127.0.0.1:3
310: Connection refused) at (eval 40) line 264.
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) PRESERVING EVIDENCE in /opt/zimbra/amavisd/tmp/amavis-20051003T161931-1
6817
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) TIMING [total 7100 ms] - SMTP EHLO: 5 (0%)0, SMTP pre-MAIL: 2 (0%)0, mk
dir tempdir: 0 (0%)0, create email.txt: 0 (0%)0, lookup_ldap: 24 (0%)0, SMTP pre-DATA-flush: 2 (0%)0, SMTP DATA: 21 (0%)1, bod
y_hash: 3 (0%)1, gen_mail_id: 1 (0%)1, mkdir parts: 1 (0%)1, mime_decode: 11 (0%)1, get-file-type1: 13 (0%)1, decompose_part:
1 (0%)1, parts_decode: 0 (0%)1, AV-scan-1: 7015 (99%)100, rundown: 2 (0%)100
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) extra modules loaded: Net/LDAP/Bind.pm
Oct 3 16:19:38 solveitsrv02 amavis[16817]: (16817-03) load: 0 %, total idle 6151.755 s, busy 25.693 s
Oct 3 16:19:38 solveitsrv02 postfix/smtp[9513]: 5EDBCFDDE4: to=
, relay=127.0.0.1[127.0.0.1], delay=
68, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in processing, id=16817-03, virus_scan FAILED: virus_scan
: ALL VIRUS SCANNERS FAILED: ClamAV-clamd av-scanner FAILED: Too many retries to talk to 127.0.0.1:3310 (Can't connect to INET
socket 127.0.0.1:3310: Connection refused) at (eval 40) line 264. (in reply to end of DATA command))
[zimbra@solveitsrv02 ~]$ zmcontrol status
Calling GetServiceInfoRequest (mailcs.solveitsimply.com)
RESPONSE: (Zimbra::Mon::serviceInfo)
antispam
status Running
antivirus
status Stopped
ldap
status Running
mailbox
status Running
mta
status Running
snmp
status Stopped
host
ip 192.168.1.12
name mailcs.solveitsimply.com
I've tried restarting zimbra but I still get the above status output.
I am getting the following error:
/opt/zimbra/clamav/sbin/clamd: error while loading shared libraries: libgmp.so.3: cannot open shared object file: No such file
or directory
in: /opt/zimbra/log/clamd.log
Is this another symlink required? If so could you let me know where and what I should be linking to?
So close 
Thanks
Jacko