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= <span id="KB170054"></span>XCON: Read Receipt May Not Be Returned From ISOCOR MTA =<br />
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Article ID: 170054<br />
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Article Last Modified on 10/28/2006<br />
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APPLIES TO<br /><br />
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* Microsoft Exchange Server 4.0 Standard Edition<br />
* Microsoft Exchange Server 5.0 Standard Edition<br />
* Microsoft Exchange Server 5.5 Standard Edition<br />
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This article was previously published under Q170054<br />
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== SYMPTOMS ==<br />
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When a Microsoft Exchange user sends a message with a read receipt request to an ISOCOR message transfer agent (MTA) user, the ISOCOR MTA may not send back a read notification report.<br />
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== CAUSE ==<br />
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This behavior can occur when the Microsoft Exchange user sends the message to an ISOCOR user with the following X.400 address:<br />
<pre class="fixed_text"> C=us;A-md;P=prmd;O=organization;S=surname;CN=common-name<br />
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When the CN address field is used over a 1984 mode X.400 connection, it is moved to the Domain Defined Attribute (DDA) field during the downgrade process. If the message also contains a delivery receipt request, the ISOCOR MTA sends that, but does not send back a read notification report. This has been found to be a limitation in the ISOCOR ISOPLEX 800 v.1.15. This behavior is by product design.<br />
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Keywords: kbbug KB170054<br />
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