Poste io Server not receiving / sending anything

Hello there, I was trying to run poste io server in a fresh container using this command

docker run -h mail.[server].me --restart unless-stopped -e VIRTUAL_HOST=mail.[server].me -e HTTPS=OFF -p 25:25 -p 800:80 -p 4430:443 -p 110:110 -p 143:143 -p 465:465 -p 587:587 -p 993:993 -p 995:995 -v /etc/localtime:/etc/localtime:ro -v /mailserver/data:/data -t analogic/poste.io

I am using cloudflare, which blocks certain ports essential for mail... so I created an DNS A-Record rediricting the subdomain "mail." to my real server ip. I created a letsencrypt cert wich showed the output just fine. I am then using nginx-proxy to route the traffic to the container. I hope the error doesn't have todo with the the HTTPS environment variable. The logs and errors (in Portainer) aren't showing anything either.

And still it wont receive or send any mails even though they show up in sent and there is eg. no rebound error (tested with google)

Glad to provide more infos,

Thanks in advance, Dominic

Edit 19.10 * non existent support seems great so far

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