Add README refs: SNS notifications, SES simulator

Looks like I need to implement bounce and complaint handling after all.
On the bright side, it looks like the SES simulator addresses will
greatly uncomplicate my contract and end to end testing.

README.md

@@ -302,6 +302,10 @@ This software is made available as [Open Source software][oss-def] under the
 - [go tool link][] (also `go tool link -help`)
 - [A better way than “ldflags” to add a build version to your Go binaries][]
 - [AWS Lambda function versions][]
+- [Sending test emails in Amazon SES with the simulator][]
+- [Setting up event notification for Amazon SES][]
+- [Receiving Amazon SES notifications using Amazon SNS][]
+- [Contents of event data that Amazon SES publishes to Amazon SNS][]
 
 [Go]: https://go.dev/
 [Amazon Web Services]: https://aws.amazon.com
@@ -380,3 +384,7 @@ This software is made available as [Open Source software][oss-def] under the
 [go tool link]: https://pkg.go.dev/cmd/link
 [A better way than “ldflags” to add a build version to your Go binaries]: https://levelup.gitconnected.com/a-better-way-than-ldflags-to-add-a-build-version-to-your-go-binaries-2258ce419d2d
 [AWS Lambda function versions]: https://docs.aws.amazon.com/lambda/latest/dg/configuration-versions.html
+[Sending test emails in Amazon SES with the simulator]: https://docs.aws.amazon.com/ses/latest/dg/send-an-email-from-console.html
+[Setting up event notification for Amazon SES]: https://docs.aws.amazon.com/ses/latest/dg/monitor-sending-activity-using-notifications.html
+[Receiving Amazon SES notifications using Amazon SNS]: https://docs.aws.amazon.com/ses/latest/dg/monitor-sending-activity-using-notifications-sns.html
+[Contents of event data that Amazon SES publishes to Amazon SNS]: https://docs.aws.amazon.com/ses/latest/dg/event-publishing-retrieving-sns-contents.html