Improve the email retry mechanism by adding 0-30% random jitter
to the exponential backoff calculation. This prevents multiple
failed emails from retrying at exactly the same time, which could
cause load spikes on the SMTP server.
Example retry times (with jitter):
- 1st retry: 1.0-1.3 minutes
- 2nd retry: 2.0-2.6 minutes
- 3rd retry: 4.0-5.2 minutes
Benjamin
353b720453