Mail forwarding from custom domain to, for example, gmail.
Image is based on alpine:3.5 linux and the resulting size is around 60 MB.
To generate docker image execute from root directory:
docker build -t local/mail .
After that a new image should be available in your local docker repository as local/mail.
You need to provide few variables when creating a container:
- HOSTNAME - server's hostname - preferably FQDN one, example: awesome-server.somedomain.com
- DOMAINS - virtual alias domains that you want to forward mails for, example: example.com somedomain.com
- EMAILS - rules for forwarding, example (you can use some-email@example.com if you want to forward just one specific email instead of using a catch all rule): @example.com myemail@gmail.com\n@somedomain.com myemail@gmail.com\n
Whole command could like this:
docker run -d -p 25:25 -e HOSTNAME=awesome-server.somedomain.com -e "DOMAINS=example.com somedomain.com" -e "EMAILS=@example.com myemail@gmail.com\n@somedomain.com myemail@gmail.com\n" --name mail local/mail