smtp-email-forward

This is a simple smtp server that can be hosted in a docker container and be used to forward the email to another address. This project is part of the blog post Simple SMTP server to forward your emails.

Features

receive email multiple domains
save emails to GCP bucket
forward the emails to another address using mailgun

Build and run

# clone the repository
git clone https://github.com/gabihodoroaga/smtp-email-forward.git
# build
cd cmd
go build

In order to run the project you need to create also a GCP bucket

GCP_BUCKET=smtpd-email-forward-123
gsutil mb -c nearline gs://$GCP_BUCKET

and a service account

# create the service account
gcloud iam service-accounts create smtpd-email-forward-123 \
    --description="A service account to write to the bucker" \
    --display-name="smtpd-email-forward-123"
# grab the email
GCP_SERVICE_ACCOUNT=$(gcloud iam service-accounts list --format="value(email)" --filter="displayName=smtpd-email-forward-123")
# give the service account the permission to create objects
gsutil iam ch serviceAccount:$GCP_SERVICE_ACCOUNT:objectCreator gs://$GCP_BUCKET
# create and save the service account key
mkdir certs
gcloud iam service-accounts keys create certs/gcpServiceAccount.json \
  --iam-account $GCP_SERVICE_ACCOUNT

and the service certificates

openssl req -x509 -newkey rsa:4096 -keyout ./certs/server.key -out ./certs/server.crt -days 365 -nodes

In order to test he mailgun integration you need to create a new mailgun account and to setup MAILGUN_DOMAIN and MAILGUN_API_KEY environment variables

gabihodoroaga/smtp-email-forward

smtp-email-forward

Features

Build and run

Authors

Referenced projects

TODO