local autodiscover configuration is not trusted

 <emailProvider id="home.arpa">
   <domain>home.arpa</domain>

   <displayName>Local email server</displayName>
   <displayShortName>local-server</displayShortName>

   <incomingServer type="imap">
     <hostname>mail.home.arpa</hostname>
     <port>993</port>
     <socketType>SSL</socketType>
     <authentication>password-cleartext</authentication>
     <username>%EMAILADDRESS%</username>
   </incomingServer>

   <outgoingServer type="smtp">
     <hostname>mail.home.arpa</hostname>
     <port>465</port>
     <socketType>SSL</socketType>
     <authentication>password-cleartext</authentication>
     <username>%EMAILADDRESS%</username>
   </outgoingServer>
 </emailProvider>

Hi, I host a autodiscover config (config-v1.1.xml) on my local mailserver, when I want to add my local mail account to thunderbird it sees the configuration, but throws an error: '''Configuration found This configuration is not trusted.''' I host a local CA, and have imported the CA root certificate into the android certificate store. But I don't think this is the problem, because Thunderbird doesn't connect to my imap server prior to throwing the error. (this is working, I can browse the local link without any certificate warning) This is my config-v1.1.xml: <?xml version="1.0" encoding="UTF-8"?> <clientConfig version="1.1"> <emailProvider id="home.arpa"> <domain>home.arpa</domain> <displayName>Local email server</displayName> <displayShortName>local-server</displayShortName> <incomingServer type="imap"> <hostname>mail.home.arpa</hostname> <port>993</port> <socketType>SSL</socketType> <authentication>password-cleartext</authentication> <username>%EMAILADDRESS%</username> </incomingServer> <outgoingServer type="smtp"> <hostname>mail.home.arpa</hostname> <port>465</port> <socketType>SSL</socketType> <authentication>password-cleartext</authentication> <username>%EMAILADDRESS%</username> </outgoingServer> </emailProvider> </clientConfig> I've tried changing "authentication" to other methods, but this doesn't seem to matter. Any Idea?