# NAME leenooks/smtp
# VERSION latest

FROM alpine

# Change to http respositories, so they we can cache the install packages
RUN if [ -n ${HTTP_PROXY} ] ; then sed -ie s'/https/http/' /etc/apk/repositories; fi

RUN apk add shadow && useradd -rc "HUB Mail Relay" -M relay -NG mail -s /sbin/nologin && echo relay:SmTpR3l2Y | chpasswd

RUN apk add --no-cache postfix opendkim opendkim-utils \
  && gpasswd -a postfix opendkim

# Config postfix
RUN sed -ie 's%#mynetworks = hash:/etc/postfix/network_table%mynetworks = /etc/opendkim/signing/TrustedHosts%' /etc/postfix/main.cf \
  && echo -n 'bWVzc2FnZV9zaXplX2xpbWl0ID0gMjU2MDAwMDAKcXVldWVfbWluZnJlZSA9IDUxMjAwMDAwCg=='|base64 -d >> /etc/postfix/main.cf

# Enable DKIM
RUN mkdir /run/opendkim \
  && echo -n 'IyBNaWx0ZXIgY29uZmlndXJhdGlvbiAtIG9wZW5ka2ltCiMgSWYgdGhlIE9wZW5ES0lNIG1pbHRl\
ciBpc24ndCBhdmFpbGFibGUsIGFjY2VwdCB0aGUgbWVzc2FnZSBhbnl3YXkuCm1pbHRlcl9kZWZh\
dWx0X2FjdGlvbiA9IGFjY2VwdAojIFdoYXQgbWlsdGVyIGNvbW11bmljYXRpb24gcHJvdG9jb2wg\
c2hvdWxkIGJlIHVzZWQgdG8gcGFzcyBtZXNzYWdlcwojIHRvIGFuZCBmcm9tIE9wZW5ES0lNPwpt\
aWx0ZXJfcHJvdG9jb2wgPSA2CiMgV2hlcmUgc2hvdWxkIHRoZSBPcGVuREtJTSBtaWx0ZXIgYmUg\
Y29udGFjdCB0aHJvdWdoPyAgTm90ZSB0aGF0IHRoaXMKIyBpcyBpbnNpZGUgdGhlIC92YXIvc3Bv\
b2wvcG9zdGZpeCBjaHJvb3QuCnNtdHBkX21pbHRlcnMgPSBpbmV0OjEyNy4wLjAuMTo4ODkxCiMg\
U2VuZCBtYWlsIHRoYXQgZG9lc24ndCBhcnJpdmUgZnJvbSB0aGUgbmV0d29yayB0aHJvdWdoIHRo\
ZSBzYW1lIG1pbHRlcgojIGFzIG91dGJvdW5kIG1haWwuCm5vbl9zbXRwZF9taWx0ZXJzID0gJHNt\
dHBkX21pbHRlcnMK' |base64 -d >> /etc/postfix/main.cf
COPY opendkim.conf /etc/opendkim

VOLUME ["/var/spool/postfix"]
EXPOSE 25

COPY init /sbin/

# Starting
ENTRYPOINT [ "/sbin/init" ]