lambda-ses-forwarder

lambda-ses-forwarder

AWS SES Email forwarder Lambda function written in Go.

This is a Lambda function to forward emails received from SES.

Setup instructions

Assuming you have SES incoming emails enabled, this function needs the following configuration.

IAM

• Create a Lambda execution role with a policy that allows
  • s3:GetObject on a bucket you can store incoming e-mails in
  • ses:SendRawEmail to forward the email to the new destination
  • Don't forget to include the default Lambda execution policy to be able to write Cloudwatch logs

Lambda

• Create a Lambda function with Go 1.x runtime and the execution role you have just created
• Build this program or download a release zip and upload it as source
• Set the exection handler name to the name of the binary (lambda_ses_forwarder_linux if you use a release)
• Memory size can be as low as 128MB if you don't receive large mails, but 256MB or higher is recommended
• You can configure the function by using these environment variables:

¹ a single RFC 5322 address, e.g. test@example.com or My Name <test@example.com>

² can include %s as replacer to include the original sender name, e.g. %s through my mail forwarder <forwarder@example.com>

Important Ensure the FORWARD_FROM address is a verified address in SES and is allowed to send mail, the original FROM address will be set as Reply-To address so you can answer the mails directly.

SES

• Create a Rule Set for the incoming address or domain you want to forward emails for
• Create a first action to store your mail in the S3 bucket from the previous steps with an optional prefix
• Create a second action to call the Lambda function you created