Seeing smtp_should_reject "400 bad request" failures on bounce processing

Bug
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I am making my mail-receiver.yaml like this (in the meantime or forever? @supermathie)

# this is the incoming mail receiver container template
##
## After making changes to this file, you MUST rebuild
## /var/discourse/launcher rebuild mail-receiver
##
## BE *VERY* CAREFUL WHEN EDITING!
## YAML FILES ARE SUPER SUPER SENSITIVE TO MISTAKES IN WHITESPACE OR ALIGNMENT!
## visit http://www.yamllint.com/ to validate this file as needed

base_image: discourse/mail-receiver:release
update_pups: false

expose:
  - "25:25"   # SMTP

env:
  LC_ALL: en_US.UTF-8
  LANG: en_US.UTF-8
  LANGUAGE: en_US.UTF-8

  ## Where e-mail to your forum should be sent.  In general, it's perfectly fine
  ## to use the same domain as the forum itself here.
  MAIL_DOMAIN: community.example.com
# uncomment these (and the volume below!) to support TLS 
  POSTCONF_smtpd_tls_key_file:  /letsencrypt/community.example.com/community.example.com.key
  POSTCONF_smtpd_tls_cert_file:  /letsencrypt/community.example.com/community.example.com.crt
  POSTCONF_smtpd_tls_security_level: may
  POSTCONF_myhostname: community.example.com
  POSTCONF_mynetworks: "127.0.0.0/8 [::1]/128 [fe80::]/64 172.17.0.0/16"
  POSTCONF_smtpd_recipient_restrictions: ""
  ## The base URL for this Discourse instance.
  ## This will be whatever your Discourse site URL is. For example,
  ## https://discourse.example.com. If you're running a subfolder setup,
  ## be sure to account for that (ie https://example.com/forum).
  DISCOURSE_BASE_URL: 'https://community.example.com'

  ## The master API key of your Discourse forum.  You can get this from
  ## the "API" tab of your admin panel.
  DISCOURSE_API_KEY: <YOURKEY>

  ## The username to use for processing incoming e-mail.  Unless you have
  ## renamed the `system` user, you should leave this as-is.
  DISCOURSE_API_USERNAME: system

volumes:
  - volume:
      host: /var/discourse/shared/mail-receiver/postfix-spool
      guest: /var/spool/postfix
# uncomment to support TLS
  - volume:
      host: /var/lib/caddy/.local/share/caddy/certificates/acme-v02.api.letsencrypt.org-directory/
      guest: /letsencrypt
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