Updated FAQ

FAQ.md

@@ -1102,6 +1102,15 @@ See also [this FAQ](#user-content-faq4).
 The error '*Handshake failed ... SSLV3_ALERT_ILLEGAL_PARAMETER*' is either caused by a bug in the SSL protocol implementation
 or by a too short DH key on the email server and can unfortunately not be fixed by FairEmail.
 
+The error '*Handshake failed ... HANDSHAKE_FAILURE_ON_CLIENT_HELLO*' might be caused by the provider still using RC4,
+which isn't supported since [Android 7](https://developer.android.com/about/versions/nougat/android-7.0-changes.html#tls-ssl) anymore.
+
+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).
+
+You can use [this website](https://ssl-tools.net/mailservers) to check for SSL/TLS problems of IMAP/SMTP servers.
+
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