Recipient address rejected: Access denied

[JoeTN]

Hi!

Thanks for a great container.
I am trying to use it to relay mails to my Office 365, via the MX-record.
It works just fine when sending directly to my MX-record, not using your container, but not when doing so through the container.

When relaying through the container I get the following error, sending from [email protected] to [email protected]:
postfix/smtpd[130]: NOQUEUE: reject: RCPT from mypc.mydomain.com[192.168.10.107]: 554 5.7.1 <[email protected]>: Recipient address rejected: Access denied; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mypc>

This is my compose-file: https://pastebin.com/xr2PLTK6

I hope you have an idea for a solution to this.

Thanks in advance :-)