ModuleNotFoundError: No module named aiosmtpd

I changed an addon to local, before I had a dockerhub image. but now when trying to start the addon I get an error.

Log

[22:24:10] INFO: starting application...
Traceback (most recent call last):
  File "/app/smtp2mqtt.py", line 13, in <module>
    from aiosmtpd.controller import Controller
ModuleNotFoundError: No module named 'aiosmtpd'

Dockerfile now

ARG BUILD_FROM
FROM $BUILD_FROM

WORKDIR /app

COPY start.sh smtp2mqtt.py /app/

RUN chmod 755 /app/start.sh

RUN apk add --no-cache
RUN apk add python3
RUN apk add py3-pip
RUN apk add py3-paho-mqtt

CMD python3 -m aiosmtpd --nosetuid

ENTRYPOINT ["/app/start.sh"]

LABEL \
 io.hass.version="VERSION" \
 io.hass.type="addon" \
 io.hass.arch="armhf|armv7|aarch64|i386|amd64" 

Dockerfile original addon github

ARG BUILD_FROM
FROM $BUILD_FROM

WORKDIR /app

COPY start.sh smtp2mqtt.py /app/

RUN chmod 755 /app/start.sh

RUN apk add --no-cache python3 py3-pip && pip3 install paho-mqtt aiosmtpd

ENTRYPOINT ["/app/start.sh"]

LABEL \
  io.hass.version="VERSION" \
  io.hass.type="addon" \
  io.hass.arch="armhf|armv7|aarch64|i386|amd64"