On 28.07.2016 21:38, Benny Pedersen wrote:
> On 2016-07-28 21:18, Noel Jones wrote:
> 
>> openssl s_client -connect yourserver:587 -starttls smtp
> 
> tested and it works with that one as it should
> 
> outlook express and andreoid works aswell, it just for me thunderbird 
> does not

Thunderbird and Postfix work here for years without a problem, so there is
most likely no general problem with this combination.

Do you have by any chance imported an old certificate in Thunderbird?
Check your certificate storage in Thunderbird.

Cheers,
  Juri

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