AWS 的 SES (Simple Email Service) 可以提供邮件收发服务。对于邮件收发的反馈，如 Bounce message, 可以发送到 SNS (Simple Notification Service) 作进一步处理。SNS 可以指定某个邮件地址作为订阅者，将消息发送到该邮箱中。然而，SNS发出来的邮件是 JSON，可读性不好，例如：
{"notificationType":"Delivery","mail":{"timestamp":"2019-02-18T06:03:02.669Z","source":"kfc@feichashao.com","sourceArn":"arn:aws:ses:us-west-2:xxxxxx:identity/feichashao.com","sourceIp":"205.251.234.36","sendingAccountId":"xxxxxx","messageId":"01010168ff335c8d-f00ce1c1-e103-49cd-912f-9f397c7a463c-000000","destination":["feichashao@gmail.com"],"headersTruncated":false,"headers":[{"name":"From","value":"kfc@feichashao.com"},{"name":"To","value":"feichashao@gmail.com"},{"name":"Subject","value":"free kfc"},{"name":"MIME-Version","value":"1.0"},{"name":"Content-Type","value":"text/plain; charset=UTF-8"},{"name":"Content-Transfer-Encoding","value":"7bit"}],"commonHeaders":{"from":["kfc@feichashao.com"],"to":["feichashao@gmail.com"],"subject":"free kfc"}},"delivery":{"timestamp":"2019-02-18T06:03:03.917Z","processingTimeMillis":1248,"recipients":["feichashao@gmail.com"],"smtpResponse":"250 2.0.0 OK 1550469783 q2si13329671plh.79 - gsmtp","remoteMtaIp":"74.125.20.27","reportingMTA":"a27-30.smtp-out.us-west-2.amazonses.com"}}
怎么能让这个提醒邮件变得更加友好呢？ SNS目前不支持自定义邮件格式。一个思路是，将 SNS 的消息发送到 Lambda 上，让 Lambda 处理好格式后，再发送到指定邮箱。即 SES -> SNS -> Lambda -> SES.
继续阅读“AWS SNS 自定义邮件格式”