9.10 to 10.04 PostFix Issues

[snmp01]

After upgrading from a working 9.10 system to 10.04 Postfix has stopped delivery email to users.

Sending email is fine and IMAP(s) and POP are working fine but receiving messages now get the follwing message

postfix/pipe[14331]: 65B941B61F0: to=<me@fred.com>, relay=dovecot, delay=1081, delays=1081/0.02/0/0.1, dsn=4.3.0, status=deferred (temporary failure)

Using Postfix with Dovecot, MySQL & Amavis plus spamassasin

Does anyone have any idea what the upgrade process may of changed in the upgrade none of the conf file were replaced during the upgrade and only one parameter caused a issue for Dovecot after the upgrade "ssl_disable = no" after disabling this dovecot started

Thanks for any help
Ian

[snmp01]

Full log info for incoming message

amavis[11903]: (11903-07) Passed CLEAN, [203.109.136.66] [203.109.136.66] <jo@sendme.com> -> <me@fred.com>, Message-ID: <0F7C3FE1-0427-45A6-86D5-5C3E7BA9AFA3@sendme.com>, mail_id: g2dA3mnd8fca, Hits: -1.901, size: 905, queued_as: DE7891B6273, 3768 ms
postfix/smtp[18091]: 16C2A1B6106: to=<me@fred.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=4, delays=0.22/0/0/3.8, dsn=2.0.0, status=sent (250 2.0.0 Ok, id=11903-07, from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as DE7891B6273)
postfix/pipe[18100]: DE7891B6273: to=<me@fred.com>, relay=dovecot, delay=0.23, delays=0.11/0/0/0.12, dsn=4.3.0, status=deferred (temporary failure)