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    <title>[MS-OXPSVAL]: Email Postmark Validation Algorithm</title>
    <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
    <description>Specifies the Email Postmark Validation Algorithm, which creates and validates computational puzzles to reduce the effectiveness of junk email.</description>
    <item>
      <title>Major Update for [MS-OXPSVAL] (Version 18.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 18.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL].pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-240820.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 20 Aug 2024</pubDate>
      <guid>MS-OXPSVAL-20240820</guid>
    </item>
    <item>
      <title>No Update for [MS-OXPSVAL] (Version 17.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 17.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-220215.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-220215.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 15 Feb 2022</pubDate>
      <guid>MS-OXPSVAL-20220215</guid>
    </item>
    <item>
      <title>Major Update for [MS-OXPSVAL] (Version 17.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 17.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-210817.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-210817.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 17 Aug 2021</pubDate>
      <guid>MS-OXPSVAL-20210817</guid>
    </item>
    <item>
      <title>Major Update for [MS-OXPSVAL] (Version 16.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 16.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-210422.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-210422.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Thu, 22 Apr 2021</pubDate>
      <guid>MS-OXPSVAL-20210422</guid>
    </item>
    <item>
      <title>Major Update for [MS-OXPSVAL] (Version 15.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 15.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-181001.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-181001.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Mon, 01 Oct 2018</pubDate>
      <guid>MS-OXPSVAL-20181001</guid>
    </item>
    <item>
      <title>Major Update for [MS-OXPSVAL] (Version 14.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 14.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-180724.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-180724.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Tue, 24 Jul 2018</pubDate>
      <guid>MS-OXPSVAL-20180724</guid>
    </item>
    <item>
      <title>No Update for [MS-OXPSVAL] (Version 13.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 13.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-160914.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-160914.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Wed, 14 Sep 2016</pubDate>
      <guid>MS-OXPSVAL-20160914</guid>
    </item>
    <item>
      <title>No Update for [MS-OXPSVAL] (Version 13.0)</title>
      <link>https://docs.microsoft.com/en-us/openspecs/exchange_server_protocols/MS-OXPSVAL/f894e839-22a2-4f72-a1af-a7de40089bc8</link>
      <description>&lt;b&gt;Protocol Revision:&lt;/b&gt; 13.0&lt;br/&gt;&lt;b&gt;Downloads:&lt;/b&gt;&lt;br/&gt;&lt;ul style="list-style-type: square;"&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-160613.pdf"&gt;PDF&lt;/a&gt;&lt;/li&gt;&lt;li&gt;&lt;a href="https://msopenspecs.azureedge.net/files/MS-OXPSVAL/[MS-OXPSVAL]-160613.docx"&gt;DOCX&lt;/a&gt;&lt;/li&gt;&lt;/ul&gt;</description>
      <pubDate>Mon, 13 Jun 2016</pubDate>
      <guid>MS-OXPSVAL-20160613</guid>
    </item>
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