I am new to Marketo and was wondering if it is possible to have a Bounceback Reason field and Bounceback Date field updated by Marketo in Salesforce?
If the field already is synced, you can do that. Or create a synced field and then push the Bounced Reason info to that field using a daily batch.
Why do you need this in SFDC? Seems like extra data only you need to see.