IMCEAMAILTO issue causing "Delivery has failed ...".

Question

What started as a single user experiencing an issue sending emails to some addresses has started to become multiple users.
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.local 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:[email protected]].
Email address has been changed to
[email protected] for confidentiality reasons.
Delivery has failed to these recipients or distribution lists:
'[email protected]'
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: mailserver.ourdomain.local
[email protected]
#550 5.4.4 ROUTING.NoNextHop; unable to route ##
Original message headers:
Received: from mailserver.ourdomain.local ([fe80::d597:2413:93ab:cf17]) by mailserver.ourdomain.local ([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 <[email protected]>
To: "'[email protected]'"
<[email protected]>
Date: Thu, 14 Oct 2010 13:58:27 +0100
Subject: email
Thread-Topic: email
Thread-Index: Actrn34QI8tEGRBCR/qQGIH5MxGgyA==
Message-ID: <[email protected].local>
Accept-Language: en-US, en-GB
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator: <[email protected].local>
MIME-Version: 1.0

Answer 1

Okay here's the skinny.  I don't see an immediate patch coming out for this.  Also I'm concerned that Microsoft sees this currently as a single call, not that a bunch of folks are impacted. 
While there is a bug they are tracking on this Offug49462, short term there will only be info detailed in the security update that there's a side effect of this update.  No eta of when exactly that wording will be posted in the bulletin, but that certainly
will be sooner than a patch fixing this.
The trigger appears to be when you click on mailto links.
You have two choices as I see it:
1. uninstall the patch, and wait until I post back that there is an ultimate fix.  I don't see this coming out in a week or two honestly, so be aware that per my read on the situtation, this won't be resolved quickly with another patch.
2. leave the security patch on, and as a workaround to ensure that you don't accidentally click on a mailto link and thus flip your email addresses and get NDRs to do the following:
In Outlook:
Click Tools > Options
Click the Mail Format tab
Click Editor Options
Click Proofing
Click AutoCorrect Options
Click the AutoFormat Tab
Uncheck "Internet and network paths with hyperlinks"
Click OK, OK and OK
Neither one is good, but it's all I have right now until something is coded up long term.
So here's where you can do me a favor.  Call 1-800-Microsoft and explain to them you have an issue with a security update 2344993, say that you too are impacted by Offup49462 bug and tell them how many in your firm/office/school have been impacted.
Like I said right now they only have one call on this issue, and I'd like to ensure they see more numbers of impacted people.
Thanks.
Susan-at-msmvps.com