You are viewing a Constituent record in The Raiser's Edge. Under the NetCommunity tab, you see an Email/Newsletter section. You may see emails listed here, but you don't see an expected Acknowledgement email.
Acknowledge emails will only show on the NetCommunity tab on a Raiser's Edge record if the constituent is logged into NetCommunity with their linked account to Raiser's Edge. If the constituent is not logged while filling out a donation, event or membership form, the acknowlegement email will not show here.