There is no single central #Signal server. Signal uses #AWS cloud, plus Google Cloud, Microsoft Cloud and Cloudflare, all under US legislation. If any of these clouds goes down or becomes otherwise problematic, chatting degrades or fails.
With #deltachat you can choose #chatmail relays (
) which distributes the risk across a wider network. We are currently working on the multi-transport feature to finally remove any central point of chat failure

Chatmail: Relays
Chatmail provides FOSS infrastructure for interoperable, secure, speedy and reliable end-to-end encrypted messaging. Check out clients as Arcane C...
chaos.social
Delta Chat (39c3) (@delta@chaos.social)
#deltachat has reliable and audited end-to-end encryption but reliable message delivery is equally crucial in times of shutdowns and increasing Int...

