this is common problem for me, and the reason I don’t use VPNs more often, I have NekoBox and I add to it some VPNs like shadowsocks VPNs from Outline but these VPN providers (or their VPS providers) seem to block the email ports, once I enable the VPNs Delta Chat can’t connect anymore which makes it really hard to use DC with VPNs, this already affects in some censorship situations when people find a VPN to bypass some restrictions and WhatsApp etc work fine but DC can’t work with the VPN