diff --git a/_licenses/sendmail.txt b/_licenses/sendmail.txt
new file mode 100644
index 000000000..ad709ec03
--- /dev/null
+++ b/_licenses/sendmail.txt
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+---
+title: Sendmail License
+spdx-id: Sendmail
+hidden: true
+
+description: A permissive license used by Sendmail and related mail-filter projects. Distinct from the later Sendmail Open Source License used in some Trusted Domain Project repositories.
+
+how: Create a text file (typically named LICENSE or LICENSE.txt) in the root of your source code and copy the text of the license into the file.
+
+using:
+  OpenDKIM: https://github.com/trusteddomainproject/OpenDKIM/blob/master/LICENSE.Sendmail
+  OpenDMARC: https://github.com/trusteddomainproject/OpenDMARC/blob/master/LICENSE.Sendmail
+  OpenARC: https://github.com/trusteddomainproject/OpenARC/blob/master/LICENSE.Sendmail
+
+permissions:
+  - commercial-use
+  - modifications
+  - distribution
+  - private-use
+
+conditions:
+  - include-copyright
+
+limitations:
+  - liability
+  - warranty
+
+---
+
+SENDMAIL LICENSE
+
+The following license terms and conditions apply, unless a redistribution
+agreement or other license is obtained from Sendmail, Inc., 6475 Christie Ave,
+Third Floor, Emeryville, CA 94608, USA, or by electronic mail at
+license@sendmail.com.
+
+License Terms:
+
+Use, Modification and Redistribution (including distribution of any modified
+or derived work) in source and binary forms is permitted only if each of the
+following conditions is met:
+
+1. Redistributions qualify as "freeware" or "Open Source Software" under one
+of the following terms:
+
+     (a) Redistributions are made at no charge beyond the reasonable cost of
+materials and delivery.
+
+     (b) Redistributions are accompanied by a copy of the Source Code or by an
+irrevocable offer to provide a copy of the Source Code for up to three years
+at the cost of materials and delivery. Such redistributions must allow further
+use, modification, and redistribution of the Source Code under substantially
+the same terms as this license. For the purposes of redistribution "Source
+Code" means the complete compilable and linkable source code of sendmail
+including all modifications.
+
+2. Redistributions of Source Code must retain the copyright notices as they
+appear in each Source Code file, these license terms, and the
+disclaimer/limitation of liability set forth as paragraph 6 below.
+
+3. Redistributions in binary form must reproduce the Copyright Notice, these
+license terms, and the disclaimer/limitation of liability set forth as
+paragraph 6 below, in the documentation and/or other materials provided with
+the distribution. For the purposes of binary distribution the "Copyright
+Notice" refers to the following language:
+"Copyright (c) 1998-2010 Sendmail, Inc. All rights reserved."
+
+4. Neither the name of Sendmail, Inc. nor the University of California nor
+names of their contributors may be used to endorse or promote products derived
+from this software without specific prior written permission. The name
+"sendmail" is a trademark of Sendmail, Inc.
+
+5. All redistributions must comply with the conditions imposed by the
+University of California on certain embedded code, which copyright Notice and
+conditions for redistribution are as follows:
+
+     (a) Copyright (c) 1988, 1993 The Regents of the University of California.
+All rights reserved.
+
+     (b) Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+          (i) Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+          (ii) Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+          (iii) Neither the name of the University nor the names of its
+contributors may be used to endorse or promote products derived from this
+software without specific prior written permission.
+
+6. Disclaimer/Limitation of Liability: THIS SOFTWARE IS PROVIDED BY SENDMAIL,
+INC. AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SENDMAIL,
+INC., THE REGENTS OF THE UNIVERSITY OF CALIFORNIA OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+$Revision: 8.16 $, Last updated $Date: 2010/10/25 23:11:19 $, Document
+139848.1