Strange IMAP Proxy

The following happened to a friend of mine who studies at the University of Hof. I'm responsible for our mailserver, so he called me and told me that he couldn't receive mails on his Android device (using K9-Mail) when being connected to the university wifi. The interesting thing was that he didn't had any problems on his laptop using Thunderbird with the equal configuration: IMAP Port 143 - STARTTLS
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My Digimode Interface

This Interface makes it possible to recive and transmitt using PSK, RTTY and all the other Digimodes using your Computer. I recommend using the Software Fldigi which runs under every OS and can additionally controll your TRX using CAT. So you can use three different methods for PTT: CAT, PTT-VOX and manual PTT with the PTT-Switch of the Interface. The Interface is really easy to build - it shouldn't take you more than a view hours.
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