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PGP: Message is blocked - recipient email address could not be resolved. Error code: [0xa1010004].
By Pranay Jha | Feb 10, 2016 | In Articles | Total Views [ 4049 ]
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CAUSE:The MAPI address space in PGP Desktop has to be configured to allow specific FAX address spaces.

SOLUTION:Add the following values to PGPprefs.xml

-To find PGPprefs.xml, go to \%username%\UPM_Profile\AppData\Roaming\PGP Corporation\PGP \PGPprefs.xml

-Edit PGPprefs.xml in notepad.

-Find <key>MAPIfaxAddressSpaceList</key>

-Look next text to this string, it will show as <string></string>.

-Replace to <string></string> as <string>FAX</string>,
Note: Same will be performed in entire PGPprefs.xml file wherever you get <key>MAPIfaxAddressSpaceList</key>

Once it will replace, text will be shown as below.

<key>MAPIfaxAddressSpaceList</key> <string>FAX</string>,

-Log off and relogin back to PC, and check fax services. It should work.

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Pranay Jha
Pranay Jha
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Thank you for visiting my profile. I am Pranay Jha, bring along a total of 11+ years of extensive experience with me in Information Technology sector for organizations from small business to large enterprises, wherein my current assignment I am associated with IBM as a Technical Solution Architect for Virtualization platform. I am vExpert x 3 (16/17/18), VCIX-DCV, VCAP5/6-DCD, VCAP5-DCA, VCP7-CMA, VCP5/6-DCV, VCA-DCV, VCA-Cloud, VSP, VCE-CIA, MCITP, MCSE, MCSA(Messaging). I am also an Independent blogger and founder of and I can be reached via email at or Direct Message via Contact Us form.

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