Bounces not getting recorded
We just sent out our first large mailing, about 4000 mails through Sparkpost. On the CiviCRM side, we show a very small number of bounces < 10. On the Sparkpost account, it shows on the order of about 400 bounces, of which many (>260) are hard bounces, most are "recipient doesn't exist." Why is there a difference? These emails went out over a 24 hr period in various logical batches, starting around 3pm Sat, Jan 21.
Do we just need to wait for the two to match? Also, this is a pretty new live CiviCRM instance. Most of our testing over a 3-month period was done using a test domain name. We then redirected to the final domain name about a month ago. Note that we also set SPF and DKIM for the new domain and ensured we were all green on the Sparkpost side. However, we didn't touch the CiviDesk Sparkpost configuration, etc. I'm wondering if the webhook isn't right. But if that were hosed, why would I get any bounces at all. Except they all seem to be of type "syntax" so perhaps that is not even being sent back by Sparkpost I had noticed a reply to another issue that said your webhook is setup on installation. Does that mean we need to reinstall?
Thanks for any help/advice