zimbraweb-smtp-bridge issue50

compose log

zimbrabridge_1  | Dec 28 20:21:13 dhbwbridge postfix/submission/smtpd[114]: connect from unknown[46.114.1.221]
zimbrabridge_1  | Dec 28 20:21:14 dhbwbridge python/zimbra_authentication.py: Trying to authenticate user AUTH_USERNAME='s212689'
zimbrabridge_1  | Dec 28 20:21:14 dhbwbridge python/zimbra_authentication.py: successfully authenticated AUTH_USERNAME='s212689'
zimbrabridge_1  | Traceback (most recent call last):
zimbrabridge_1  |   File "/srv/zimbraweb/zimbra_milter.py", line 159, in <lambda>
zimbrabridge_1  |     lambda ctx, *b: ctx.getpriv().envfrom_bytes(*b))
zimbrabridge_1  |   File "/usr/lib/python3.9/site-packages/Milter/__init__.py", line 363, in envfrom_bytes
zimbrabridge_1  |     return self.envfrom(s[0],*s[1:])
zimbrabridge_1  |   File "/srv/zimbraweb/zimbra_milter.py", line 56, in envfrom
zimbrabridge_1  |     if "@" in self.user:
zimbrabridge_1  | TypeError: argument of type 'NoneType' is not iterable
zimbrabridge_1  | Dec 28 20:21:16 dhbwbridge postfix/submission/smtpd[114]: warning: unknown[46.114.1.221]: SASL login authentication failed: UGFzc3dvcmQ6
zimbrabridge_1  | Dec 28 20:21:16 dhbwbridge postfix/submission/smtpd[114]: NOQUEUE: milter-reject: MAIL from unknown[46.114.1.221]: 451 4.3.0 pymilter: untrapped exception in pythonfilter; from=<s212689@student.dhbw-mannheim.de> proto=ESMTP helo=<Julian-X380>
zimbrabridge_1  | Dec 28 20:21:16 dhbwbridge postfix/submission/smtpd[114]: lost connection after MAIL from unknown[46.114.1.221]
zimbrabridge_1  | Dec 28 20:21:16 dhbwbridge postfix/submission/smtpd[114]: disconnect from unknown[46.114.1.221] ehlo=1 auth=0/1 mail=0/1 commands=1/3

docker-compose.yml

version: '3'
services:
  zimbrabridge:
    image: ghcr.io/cirosec-studis/zimbraweb-smtp-bridge:dev
    restart: unless-stopped
    hostname: dhbwbridge
    environment:
    - ENVCONFIG=true
    - smtp_fallback=enabled
    - smtp_fallback_relay_host=dhbwrelay
    networks:
      - front
    ports:
      - '587:587'

  dhbw_relay:
    image: boky/postfix
    restart: unless-stopped
    hostname: dhbwrelay
    environment:
    - ALLOWED_SENDER_DOMAINS=student.dhbw-mannheim.de
    networks:
      front:
        aliases:
        - dhbwrelay

networks:
  front:
    external: true