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I cannot send emails anymore with Thunderbird

Thunderbird Send and receive email
m.schilperoort replied
m.schilperoort
m.schilperoort

Hello, after updating the last version 128.10.0 I cannot send emails anymore. I read online about possible solutions, nothing worked. I have an updated Windows 11, my provider is KPN (Telfort). Telfort is a company that has been taken over by KPN, but I can still use my Telfort email address and smtp.telfort.nl as smtp address. That has not changed. I tried several adjustment for the smtp adrress, but the problem remained. 

 I hope you can help me, thank you.
Hello, after updating the last version 128.10.0 I cannot send emails anymore. I read online about possible solutions, nothing worked. I have an updated Windows 11, my provider is KPN (Telfort). Telfort is a company that has been taken over by KPN, but I can still use my Telfort email address and smtp.telfort.nl as smtp address. That has not changed. I tried several adjustment for the smtp adrress, but the problem remained. I hope you can help me, thank you.
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m.schilperoort
m.schilperoort Question owner

I solved the problem by deleting a second account in Thunderbird. Appearantly that account disrupted my main account