diff --git a/FAQ.md b/FAQ.md
index 7fd1bfb531..8eb70aa00f 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -2095,6 +2095,9 @@ The error '*Handshake failed ... UNSUPPORTED_PROTOCOL or TLSV1_ALERT_PROTOCOL_VE
 might be caused by enabling **hardening connections** or **Bouncy Castle** in the connection settings tab page,
 or by Android not supporting older protocols anymore, like SSLv3 and TLSv1.
 
+The error '*javax.net.ssl.SSLHandshakeException: Read error: ... CERT_LENGTH_MISMATCH*' means that there is something wrong with the email server setup.
+Try to switch to port 993 (IMAP) or 465 (SMTP) with SSL/TLS.
+
 Android 8 Oreo and later [do not support](https://developer.android.com/about/versions/oreo/android-8.0-changes#security-all) SSLv3 anymore.
 There is no way to workaround lacking RC4 and SSLv3 support because it has completely been removed from Android (which should say something).
 
diff --git a/index.html b/index.html
index a4251cff78..afb1b02235 100644
--- a/index.html
+++ b/index.html
@@ -1173,6 +1173,7 @@ X-Google-Original-From: Somebody &lt;somebody+extra@example.org&gt;</code></pre>
 <p>The error ‘<em>Handshake failed … HANDSHAKE_FAILURE_ON_CLIENT_HELLO …</em>’ might be caused by the provider still using RC4, which isn’t supported since <a href="https://developer.android.com/about/versions/nougat/android-7.0-changes.html#tls-ssl">Android 7</a> anymore.</p>
 <p>The error ‘<em>Handshake failed SSL handshake terminated … SSLV3_ALERT_HANDSHAKE_FAILURE … HANDSHAKE_FAILURE_ON_CLIENT_HELLO</em>’ can be caused by <a href="https://issuetracker.google.com/issues/37122132">this Android 7.0 bug</a>. This can unfortunately not be fixed by FairEmail.</p>
 <p>The error ‘<em>Handshake failed … UNSUPPORTED_PROTOCOL or TLSV1_ALERT_PROTOCOL_VERSION or SSLV3_ALERT_HANDSHAKE_FAILURE …</em>’ might be caused by enabling <strong>hardening connections</strong> or <strong>Bouncy Castle</strong> in the connection settings tab page, or by Android not supporting older protocols anymore, like SSLv3 and TLSv1.</p>
+<p>The error ‘<em>javax.net.ssl.SSLHandshakeException: Read error: … CERT_LENGTH_MISMATCH</em>’ means that there is something wrong with the email server setup. Try to switch to port 993 (IMAP) or 465 (SMTP) with SSL/TLS.</p>
 <p>Android 8 Oreo and later <a href="https://developer.android.com/about/versions/oreo/android-8.0-changes#security-all">do not support</a> SSLv3 anymore. There is no way to workaround lacking RC4 and SSLv3 support because it has completely been removed from Android (which should say something).</p>
 <p>Please <a href="https://developer.android.com/reference/javax/net/ssl/SSLSocket">see here</a> for an overview of supported protocols and cipher suites by Android version.</p>
 <p>You can use <a href="https://ssl-tools.net/mailservers">this website</a> or <a href="https://www.immuniweb.com/ssl/">this website</a> to check for SSL/TLS problems of email servers.</p>