Code:
Feb 14 10:29:16 dev53 sendmail[4637]: s1EATEEo004637: Authentication-Warning: www.craig.dev-crmpicco.lan: apache set sender to client.care@crmpicco.co.uk using -f
Feb 14 10:29:16 dev53 sendmail[4637]: s1EATEEo004637: from=client.care@crmpicco.co.uk, size=11017, class=0, nrcpts=0, msgid=<1392373753.d4a897919a124958e699170b2b1dc8f2@PHPMAILSERVER>, relay=apache@localhost
Feb 14 10:29:16 dev53 sendmail[5119]: s1EATG5R005119: Authentication-Warning: www.craig.dev-crmpicco.lan: apache set sender to client.care@crmpicco.co.uk using -f
Feb 14 10:29:16 dev53 sendmail[5119]: s1EATG5R005119: from=client.care@crmpicco.co.uk, size=9507, class=0, nrcpts=1, msgid=<1392373756.8e5e15c4e6d09c8333a17843461041a9@PHPMAILSERVER>, relay=apache@localhost
Feb 14 10:29:16 dev53 sendmail[5135]: s1EATGpY005135: from=<client.care@crmpicco.co.uk>, size=9684, class=0, nrcpts=1, msgid=<1392373756.8e5e15c4e6d09c8333a17843461041a9@PHPMAILSERVER>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Feb 14 10:29:16 dev53 sendmail[5119]: s1EATG5R005119: to=cmorton@crmpicco.co.uk, ctladdr=client.care@crmpicco.co.uk (48/48), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=39507, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (s1EATGpY005135 Message accepted for delivery)
Feb 14 10:29:18 dev53 sendmail[5199]: s1EATGpY005135: to=<cmorton@crmpicco.co.uk>, delay=00:00:02, xdelay=00:00:02, mailer=esmtp, pri=129684, relay=smx1.crmpiccov3.co.uk. [217.158.143.122], dsn=5.7.1, stat=User unknown
Feb 14 10:29:18 dev53 sendmail[5199]: s1EATGpY005135: s1EATIpY005199: DSN: User unknown
Feb 14 10:29:18 dev53 sendmail[5199]: s1EATIpY005199: to=<client.care@crmpicco.co.uk>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=40917, relay=smx1.crmpiccov3.co.uk. [217.158.143.122], dsn=5.7.1, stat=User unknown
Feb 14 10:29:18 dev53 sendmail[5199]: s1EATIpY005199: s1EATIpZ005199: return to sender: User unknown
Feb 14 10:29:18 dev53 sendmail[5199]: s1EATIpZ005199: to=root, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=41941, dsn=2.0.0, stat=Sent