Mail Delivery Errors not logged under activity for the lead

[Anonymous]

The e-mail address we use to send out e-mails frequently gets bounce-backs saying "Mail Delivery Error; the address X does not exist on this server" but when I look up the lead, the activity log just shows that the message was "delivered". 

Shouldn't this be logged as a bounce or soft-bounce, and then after a few bounces the lead is blocked from receiving further messages?  Does it take longer than an hour or two for Marketo to recognize a bounce?  I don't want to blanket delete all leads from certain high-bounce domain names, but if Marketo is not aware of this sort of bounce I don't see another way other than manually tweaking each of a couple hundred lead records.   Ideas?

thanks!

[Josh_Hill13]

Perhaps Autumn can shed some light on that. It could be a timing issue.

I often don't check these reports until 2-3 days afterwards because it takes time for everyone to receive and look at their emails. It could be that Marketo needs some time too, although it shouldn't.

[Anonymous]

It's been 48 hours, and there is still no indication that the e-mail bounced for the lead, even though the bounced e-mail message was returned to us a few moments after the message was sent. Besides the lead activity and the campaign results tab, is there somewhere else I can look for evidence that Marketo is aware of the bounce?