Ability to synchronize "old" messages from the e-mail server

Feature Proposal
1

You can add the “synchronization of messages from the server” functionality (by date) to DeltaChat, because only new messages are displayed

2

Duplicate of Feature request: import old messages (assuming you have the keys)

4

just implement it yourself if you want it, you have no basis nor right to demand anything from the devs.

I guess you could also offer to sponsor features.