Acknowledge events as processed. Call this after successfully processing events to prevent replay.

const options = {
  method: 'POST',
  headers: {
    'Connect-Protocol-Version': '<connect-protocol-version>',
    Authorization: 'Bearer <token>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({eventIds: ['<string>']})
};

fetch('https://api.simpleemailapi.dev/v1.EmailService/AckEvents', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "ackedCount": 123
}