Amazon AWS limitations on the resources that are available to users

Amazon imposes initial limits on several of its resources (EC2 instances, EBS Snapshots, EBS Volumes, ELB, and Elastic IPs) in order to discourage inappropriate consumption. 

Although each AWS account has several default resource limitations, you can make a request to Amazon to increase these limits when necessary.

In order for you to increase your limits with Amazon you will need to fill out a different web form for each type of resource:

Email Sending Limitations

In a similar way, Amazon also places limits on the amount of email that can be sent from AWS accounts.  If you plan to send large amounts of email from EC2 instances and wish to have these limits removed from your account, you can put in a formal request.