Create SECURITY.md

SECURITY.md

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+# Security Policies and Procedures
+
+This document outlines security procedures and general policies for the _mailcow: dockerized_ project as found on [mailcow-dockerized](https://github.com/mailcow/mailcow-dockerized).
+
+  * [Reporting a Vulnerability](#reporting-a-vulnerability)
+  * [Disclosure Policy](#disclosure-policy)
+  * [Comments on this Policy](#comments-on-this-policy)
+
+## Reporting a Vulnerability 
+
+The mailcow team and community take all security vulnerabilities
+seriously. Thank you for improving the security of our open source 
+software. We appreciate your efforts and responsible disclosure and will
+make every effort to acknowledge your contributions.
+
+Report security vulnerabilities by emailing the mailcow team at:
+
+    info at servercow.de
+
+mailcow team will acknowledge your email as soon as possible, and will
+send a more detailed response afterwards indicating the next steps in 
+handling your report. After the initial reply to your report, the mailcow
+team will endeavor to keep you informed of the progress towards a fix and
+full announcement, and may ask for additional information or guidance.
+
+Report security vulnerabilities in third-party modules to the person or 
+team maintaining the module.
+
+## Disclosure Policy
+
+When the mailcow team receives a security bug report, they will assign it
+to a primary handler. This person will coordinate the fix and release
+process, involving the following steps:
+
+  * Confirm the problem and determine the affected versions.
+  * Audit code to find any potential similar problems.
+  * Prepare fixes for all releases still under maintenance.
+
+## Comments on this Policy
+
+If you have suggestions on how this process could be improved please submit a
+pull request.