Here’s how I found out about this. I set up a mail server on a local network without internet access. Then I launched DeltaChat on several computers in that network and tested sending and receiving messages using my mail server as a relay. This was done on version 2.25. When I updated DeltaChat to …

Delta Chat does not try to connect to these servers, only resolves DNS to use as a fallback STUN and TRUN server for calls. It does not connect to these domain names if you don’t use calls. Probably should postpone resolving the names until the call feature is used. There is also a related issue ca…

I agree, it’s very unpleasant to see that when you use your own mail server — whether a classic one or a chatmail server — there are constantly requests going to third-party servers. You don’t even need to look for them, it’s happening all the time. It would be great to exclude all outgoing connecti…

This sounds like a really easy way for authorities to cut off access to recent versions of Deltachat. We’ve seen a lot of political internet shutdowns lately, so isolated-intranet operation will be very important to some users. Speaking of which, could we have a DC-over-mesh-networks tutorial? I he…

I think it would be great if users could enter the server address for calls, just like they could enter a mail relay address. There are regions where internet access is whitelisted. Only state mail works. If DeltaChat can’t connect to mail because it can’t connect to its own servers, as happened in…

[image] ajypz7p5y: If DeltaChat can’t connect to mail because it can’t connect to its own servers […] things get quite mixed here. Delta Chat does not rely on the servers mentioned above. and esp can continue working with others when internet access is restricted for whatever reason. the se…

[image] r10s: … Delta Chat does not rely on the servers mentioned above. … No. You’ve misunderstood the problem. DeltaChat relies on these servers I mentioned above. The inability to connect to your own local mail server due to the unavailability of internet servers was discovered and is now …

[image] ajypz7p5y: inability to connect to your own local mail server due to the unavailability of internet servers That is a bug and it’s going to get fixed.

DeltaChat connects to unknown servers without permission

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WofWca January 15, 2026, 6:11am 8

That is a bug and it’s going to get fixed.