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Deploying to EC2
Amazon's EC2 isn't a great place to host a mail server. For one, you don't know if you'll get an IP address with a bad reputation from its previous owner. Also, setting reverse DNS requires a special request. But EC2 makes deployment easy, so it may at least be useful for testing.
Instructions
Sign up for Amazon Web Services.
Create an Access Key at https://console.aws.amazon.com/iam/home?#security_credential. Download the key and save the information somewhere secure.
Set up your environment and paste in the two parts of your access key that you just downloaded:
sudo apt-get install ec2-api-tools
export AWS_ACCESS_KEY=your_access_key_id
export AWS_SECRET_KEY=your_secret_key
export EC2_URL=ec2.us-east-1.amazonaws.com
export AWS_AZ=us-east-1a
Here we're using the Ubuntu 13.04 amd64 instance-store-backed AMI in the us-east region. You can select another at http://cloud-images.ubuntu.com/locator/ec2/.
Generate a new "keypair" (if you don't have one) that will let you SSH into your machine after you start it:
ec2addkey mykey > mykey.pem
chmod go-rw mykey.pem
Then launch a new instance. We're creating a m1.small instance --- it's the smallest instance that can use an instance-store-backed AMI. So charges will start to apply.
source ec2/start_instance.sh
It will wait until the instance is available.
You'll probably want to associate it with an Elastic IP. If you do, you'll need to update the INSTANCE_IP variable.
Log into the server:
ssh -i mykey.pem ubuntu@$INSTANCE_IP
Then follow the instructions in the main README.
If you were just testing and are ready to destroy your instance (and all data), run:
ec2-terminate-instances $INSTANCE