K9 empfängt und sendet keine Nachrichten

Hello, I was using K9 for quite a while and all was good.
I’ m using 4 accounts. now as of a sudden I cannot receive or send any messages. on my laptops all works fine.
What could my problem be , any idea who to resolve it.
rgs Hans

Go through the account set-up for incoming/outgoing mail again, it should tell you what the issue is.

Then anybody who wants to help will need details like device + Android version, K-9 version etc.

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