Problem with Let's Encrypt Certificate

[KSB]

On 2017.02.17. 22:31, Bastian Sebode wrote:
> Hey Robert,
>
> thanks for your reply.
>
> Am 17.02.2017 um 19:28 schrieb Robert L Mathews:
>> Looking at your dovecot -n, you're using two different files here:
>>
>> ssl_cert = </etc/ssl/sebode-online.de/chain.pem
>> ssl_key = </etc/ssl/sebode-online.de/key.pem
>>

Are You sure, chain.pem contains your cert + immediate? By default 
certbot in chain.pem includes only itermediate cert's and if you wan't 
everything, it's included in fullchain.

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KSB