Set up Delta Chat with two test accounts on different email providers and exchange messages, attachments, and a group invitation. Check delivery when one device has been offline and how contacts verify each other. Confirm the encryption state visible to users rather than assuming every email path behaves identically.
Email infrastructure affects reliability and account recovery. Document how devices are added or replaced and keep a fallback channel for urgent communication. Choose the tool after a real cross-provider pilot.
Akousa