Amazon Web Services (AWS) has put limitations in place by default on EC2 instances and Lambda serverless functions to limit abuse.
Requesting your SMTP Relay
The UW Email team has set up an SMTP relay service to help manage email sending and monitoring. See Requesting SMTP Relaying for sending unauthenticated email for additional details.
For an EC2 server, prior to making this request, you will need to have established an elastic IP and assigned it to your server, so that the IP stays stable over time.
The SMTP relay service request form will also have instructions for setting up access for the UW Email team.
Lifting Email Sending Limitations
AWS puts email sending limitations in place on its resources by default. To request that the email sending be lifted, you must send a request from your account.
It may be helpful to include a link to the SMTP relay service KB (Requesting SMTP Relaying for sending unauthenticated email ) as part of the request, to indicate that this is an actively monitored and managed SMTP server.
The Public Cloud team is here to help! Contact the Public Cloud Team (for AWS, Azure & GCP)