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File: //usr/share/webmin/virtual-server/help/spf_tlsa.html
<header>TLSA records enabled?</header>

When enabled, Virtualmin will create TLSA DNS records that are used to publish
SSL certificates for this virtual server. Clients can then validate that the
expected certificate is presented, which adds an additional defence against
man-in-the-middle attacks. <p>

<footer>