A simple "SMTP Only" postfix image.
Emails can be sent everywhere but only from localhost addresses:
- 127.0.0.0/8
- 172.16.0.0./12
- [::1]/128
Start the image and include your hosts DNS entry as below:
docker run -d --name postfix -p 25:25 --restart always citizen010/postfix btcpay.domain.name
Where the first 25 is the local port and the second 25 is the container port.
Remember to change btcpay.domain.name with your own domain name.
This images is available on docker hub and can be downloaded by running
docker pull citizen010/postfix
SSH into the machine that host your BTCPayServer instance and run:
docker exec -it postfix /bin/bash
postconf mail_version
You should see something like this:
mail_version = 3.3.0
Then exit:
exit
Go to Server Settings -> Email server and fill as below:
- SMTP Server: your external IP address (to find out:
curl -s ipinfo.io/ip) - PORT: 25
- Sender's display name: whatever (e.g. BTCPay Store)
- Sender's email address: youchoose@btcpay.domain.name (e.g. store@btcpay.domain.name)
- Login: empty
- Password: empty
- Enable SSL: not checked
- Test Email: yourname@yourisp.com
Press Send Test Email
You should see Email sent to yourname@yourisp.com, please, verify you received it and then check (also on Spam folder) if a test email was received.
Press Save
If you see an error message (eg. error 4.7.1) double check the parameters and try again.