Difficulty sending e-mails via Thunderbird to addresses at yahoo.co.uk

We have recently discovered that e-mails we have sent to friends with addresses that end @Yahoo.co.uk have NOT been received, despite Thunderbird confirming the messages were sent and we have not received any Undeliverable message alerts. Once we were aware of the problem we sent 4 e-mails to one of our friends and they only received 2 of them, another friend was sent 7 e-mails and only received 2 of them! What is annoying us is that we cannot tell when or if an e-mail has really been delivered to a Yahoo.co.uk e-mail address. We run a small business and we cannot afford to loose business because our e-mails don't get through!
To date we have only become aware of this problem with Yahoo e-mail addresses, but maybe it affects other servers?
Please can you help - what can we do to be certain our e-mails really do get through?
Many thanks,
Ian Lister
== URL of affected sites ==
http://yahoo.co.uk

Thunderbird support is over here.
[http://www.mozillamessaging.com/en-US/support/]
or here:
http://forums.mozillazine.org/viewforum.php?f=39

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