Hello ,
recently there was a request about DeltaChat and the situation in Iran.
Maybe this thread here can help you:
DC basically works with any provider that uses IMAP.
With Gmail it is necessary to activate two-factor authentication and then create an app password.
This password must then be entered in DC.
Unfortunately, the normal password does not work.
Here is a list of providers that have been tested with DC:
Some of the information in the list is no longer up-to-date:
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