Postfix blocking Yahoo/webmail

Hi
I have successfully setup Postfix using osx.topicdesk's Frontline Spam Defence for OS X and this works very well at blocking most spam.
However we have a problem with certain emails getting blocked. Today my colleague at our other office tried to send us an email using his Yahoo webmail service and it was blocked by Postfix at our end.
Here is the log entry:
Jan 31 12:33:45 eddie postfix/smtpd[12618]: warning: 82.118.112.81: hostname 82-118-112-81.no-dns.keme.net verification failed: nodename nor servname provided, or not known
81.118.112.81 is the IP address of our remote site. keme.net is our ISP at that site. My guess is that mail sent with Yahoo webmail uses Yahoo's mail server but reports the IP address of the client connected to Yahoo when communicating with the recipient smtp server. And for some reason this does not resolve correctly in some way for postfix?
Interestingly, the mailer daemon bounce message gives the wrong error message to the sender:
195.137.57.151 does not like recipient.
Remote host said: 550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in local recipient table
Giving up on 195.137.57.151.
Does anyone have a clue for me?
Many thanks
James

Sorry to be not clear. The sender is sitting in our remote office and all mail which comes from the mail server at that office seems to come through fine. The sender however prefers to use Yahoo webmail and therefore the message was sent from Yahoo's server and not our server at that office.
When he received a bounce message I looked in the log for something to match against and the only thing which I could find was a message apparently from our server at the remote office which had a warning message as I described. I wondered if Yahoo's mail server was reporting the IP address of the sender (which would be the same as the IP address of our server as he was on that LAN) instead of Yahoo's own IP but thinking about this that is very unlikely. I think you are right that this log entry is for a different message.
I know you need more log but I will have to wait until it happens again now that I have turned the log up. In the mean time:
1. What is this warning message trying to tell me?
31 12:33:45 eddie postfix/smtpd12618: warning: 82.118.112.81: hostname 82-118-112-81.no-dns.keme.net verification failed: nodename nor servname provided, or not known
2. How would Yahoo Mail be talking to the wrong server? The bounce message has the correct IP address. However you might well be right as I could not find any log entries for a rejection during that time frame other than the one which you think is not related.
Here is your postconf as requested:
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
disablevrfycommand = yes
enableserveroptions = yes
html_directory = no
inet_interfaces = all
localrecipientmaps = proxy:unix:passwd.byname $alias_maps
luser_relay =
mail_owner = _postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mapsrbldomains =
messagesizelimit = 0
mydestination = $myhostname,localhost.$mydomain,afishcallededdie.com,waveneyrivercentre.co.uk,b roadlandholidays.com,broads-holidays.co.uk,broads-holidays.com,broadsbreaks.co.u k,broadsbreaks.com,daycruiser.co.uk,daycruisers.co.uk,eddiethepike.co.uk,largefi sh.co.uk,waveneyrivercentre.com,waveneyrivercenter.co.uk,waveneyrivercenter.com
mydomain = waveneyrivercentre.co.uk
mydomain_fallback = localhost
myhostname = eddie.waveneyrivercentre.co.uk
mynetworks = 127.0.0.1/32
mynetworks_style = host
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtpdclientrestrictions = permitsaslauthenticated, permit_mynetworks, rejectrblclient zen.spamhaus.org, permit
smtpddatarestrictions = permit_mynetworks, rejectunauthpipelining, permit
smtpdhelorequired = yes
smtpdhelorestrictions = permitsaslauthenticated, permit_mynetworks, checkheloaccess hash:/etc/postfix/helo_access, rejectnon_fqdnhostname, rejectinvalidhostname, permit
smtpdpw_server_securityoptions = login,gssapi,cram-md5
smtpdrecipientrestrictions = rejectinvalid_hostname,reject_non_fqdnsender, rejectnon_fqdnrecipient, permitsaslauthenticated, permit_mynetworks, rejectunauthdestination, rejectunlistedrecipient, rejectrblclient zen.spamhaus.org, permit
smtpdsasl_authenable = yes
smtpdsenderrestrictions = permitsaslauthenticated, permit_mynetworks, rejectnon_fqdnsender, permit
smtpdtls_keyfile = $smtpdtls_certfile
smtpduse_pwserver = yes
unknownlocal_recipient_rejectcode = 550
Hope that tells you something
Many thanks for your kind assistance.
James

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