Error: proxy: Remote returned invalid banner: 220

[Stephan Bosch]

On 29/11/2019 19:01, Marc Roos via dovecot wrote:
> I had a working proxy setup added sieve to it, and out of the blue I get
> this
>
> Error: proxy: Remote returned invalid banner: 220
>
> No idea what to do, nothing even in the mail list archive

Looks a lot like you're mixing up protocols, but I need your 
configuration to confirm (output from `dovecot -n`).

Regards,

Stephan.