<p></p>
<p dir="auto"><a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/tomhughes/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/tomhughes">@tomhughes</a></p>
<blockquote>
<p dir="auto">But they're not always MS controlled emails? They can be from arbitrary third party providers, they just get verified at signup time?</p>
</blockquote>
<p dir="auto">This is correct. I assume the situation is similar with facebook login, but I cannot confirm since I am not their user... Maybe we can think of a separate strategy to detect and address stale emails in general case.</p>

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