public async Task RetryAsync(EmailMessage emailMessage)
{
emailMessage.RetryCount++;
var delay = backoffStrategy.GetDelay(emailMessage.RetryCount);
// see https://github.com/EasyNetQ/EasyNetQ/wiki/Support-for-Delayed-Messages-Plugin
await bus.FuturePublishAsync(DateTime.UtcNow.Add(delay), emailMessage);
logger.LogError($"Delaying {emailMessage.Id} for {delay}");
}