Usually markdown supports a shortcut syntax with angle brackets for email addresses:
<info@example.org>
On write.as this does not work. The email address and the angle brackets are completely removed from the rendered text if the post is published.
Rendering of an email address as a link can be achieved in one of the two following ways:
<mailto:info@example.org>
[info@example.org](mailto:info@example.org)