This can be caused by using an incorrect host name, so first double-check the host name in the advanced identity/account settings (tap *Manual setup and account options*).
This can be caused by using an incorrect host name, so first double-check the host name in the advanced identity/account settings (tap *Manual setup and account options*).
Please see the documentation of the email provider about the right host name.
Please see the documentation of the email provider about the right host name.
Sometimes the right host name is in the error message.
Sometimes the right host name is in the error message.
<p>This can be caused by using an incorrect host name, so first double-check the host name in the advanced identity/account settings (tap <em>Manual setup and account options</em>). Please see the documentation of the email provider about the right host name. Sometimes the right host name is in the error message.</p>
<p>This can be caused by using an incorrect host name, so first double-check the host name in the advanced identity/account settings (tap <em>Manual setup and account options</em>). Please see the documentation of the email provider about the right host name. Sometimes the right host name is in the error message.</p>
<p><del>Another possible cause is <ahref="https://github.com/appmattus/certificatetransparency">Certificate transparency</a> failing, so try disabling it in the connection settings tab page.</del></p>
<p><del>Another possible cause is <ahref="https://github.com/appmattus/certificatetransparency">Certificate transparency</a> failing, so try disabling it in the connection settings tab page.</del></p>
<p>You should try to fix this by contacting your provider or by getting a valid security certificate because invalid security certificates are insecure and allow <ahref="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">man-in-the-middle attacks</a>. If money is an obstacle, you can get free security certificates from <ahref="https://letsencrypt.org">Let’s Encrypt</a>.</p>
<p>You should try to fix this by contacting your provider or by getting a valid security certificate because invalid security certificates are insecure and allow <ahref="https://en.wikipedia.org/wiki/Man-in-the-middle_attack">man-in-the-middle attacks</a>. If money is an obstacle, you can get free security certificates from <ahref="https://letsencrypt.org">Let’s Encrypt</a>.</p>