In Outlook 2007, when a user does a reply to some emails the E-mail Type: changes from the normal SMTP to MAILTO and then when the user sends the email it is rejected because either Outlook or our Exchange server is adding @domain.nl to the end of the recipient’s email address.
This also happens with emails where the senders address is shown as a clickable option [mailto:persons.name@domain.co.uk].
Email address has been changed to Persons.name@domain.co.uk for confidentiality reasons.
Delivery has failed to these recipients or distribution lists:
‘Persons.name@wardvissers.nl’
A problem occurred during the delivery of this message. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or provide the following diagnostic text to your system administrator.
_____
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: ward-ex01.wardvissers.nl
IMCEAMAILTO-Persons+2Ename+40domain+2Eco+2Euk@wardvissers.nl
#550 5.4.4 ROUTING.NoNextHop; unable to route ##
Original message headers:
Received: from ward-ex01.wardvissers.nl ([fe80::d597:2413:93ab:cf17]) by ward-ex01.wardvissers.nl ([fe80::d597:2413:93ab:cf17%13]) with mapi; Thu, 14 Oct 2010 13:58:28 +0100
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Internal User <Internal@wardvissers.nl>
To: "’Persons.Name@domain.co.uk’"
<IMCEAMAILTO-Persons+2Ename+40domain+2Eco+2Euk@wardvissers.nl>
Date: Thu, 14 Oct 2010 13:58:27 +0100
Subject: email
Thread-Topic: email
Thread-Index: Actrn34QI8tEGRBCR/qQGIH5MxGgyA==
Message-ID: <DC037DCA5E8D0F4585E53F80A5599ADC02339D6B5325@ward-ex01.wardvissers.nl>
Accept-Language: en-US, en-GB
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator: <DC037DCA5E8D0F4585E53F80A5599ADC02339D6B5325@ward-ex01.wardvissers.nl>
MIME-Version: 1.0
Solution: 
Removing Microsft Office Word 2007 (KB2344993) update from the computer did the trick