email service issues through German VPN location
For the last days, I'm having issues communicating with my mail-accounts (3 physically different server locations in Germany: GMX, 1&1 and one public university), both rending and receiving, if freedome is connected to Falkenstein/Germany. If I disconnect or even if I simply change the location, e.g. to Copenhagen, the problem is resolved and I can normally get and send mails througjh these servers. All my email traffic is going through STARTTLS connections.
Platform: Windows 10
Mail program: Thunderbird 45.4.0