Yes the mx point to the mail.domainname.com and the A record for mail points to one of the four ip address assigned to the server
you can see email being delivered in the mail log for the mailboxes that have been set up but the connection is refused, in a similar way to the log in through Squirrelmail not working.
Feb 12 11:36:57 wsrv1 postfix/smtpd: D3DE81D801: client=mail-iw0-f175.google.com[188.8.131.52]
Feb 12 11:36:58 wsrv1 postfix/cleanup: D3DE81D801: message-id=
Feb 12 11:36:58 wsrv1 postfix/qmgr: D3DE81D801: from=, size=1850, nrcpt=1 (queue active)
Feb 12 11:36:58 wsrv1 postfix/smtp: D3DE81D801: to=, relay=127.0.0.1[127.0.0.1]:10024, delay=0.67, delays=0.37/0.01/0/0.29, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=14358-02, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as 5DA9D1D808)
Feb 12 11:36:58 wsrv1 postfix/qmgr: D3DE81D801: removed
Feb 12 11:37:00 wsrv1 postfix/smtp: 63FA41D80C: to=, relay=ASPMX2.GOOGLEMAIL.COM[184.108.40.206]:25, delay=2.2, delays=0/0.01/0.17/2, dsn=2.0.0, status=sent (250 2.0.0 OK 1297510620 rc7si968760bkb.94)
Feb 12 11:37:00 wsrv1 postfix/qmgr: 63FA41D80C: removed
bounced email message
his is the mail system at host wsrv1.smallbizwebhosts.co.uk.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The mail system
<email@example.com>: user unknown. Command output:
ERR: authdaemon: s_connect() failed: Permission denied Invalid user
Final-Recipient: rfc822; firstname.lastname@example.org
Diagnostic-Code: x-unix; ERR: authdaemon: s_connect() failed: Permission denied
Invalid user specified.
---------- Forwarded message ----------
From: Ian Wilson <email@example.com>
Date: Sat, 12 Feb 2011 11:36:56 +0000
Subject: test 8
this is test 8