Why I Stopped Using Blue Mail (Type Mail)

David Sklar explains why he stopped using Blue Mail on his android phone:

Fast forward a few weeks when I was noodling around and wondering what sort of network traffic my phone was doing when I did routine tasks. I ran a tcpdump on my home router to capture some traffic and loaded it up into Wireshark to investigate.

Most of the traffic looked familiar: IMAP and SMTP to my mail servers, HTTP to some web hosts I browsed. But there was a connection to port 10101 on an address that resolved to an AWS host. The payload was garbled – probably TLS. What was it?