Ads in emails?
I don't ever get ads in my emails, man I must be doing something wrong in life..
I do get spam emails sometimes but the spam filters from my ISP does a good job keeping them out of my mail box..
As far as Outlook goes, each version has changed were to find the blocked list.. Perhaps start with that and post the version of Outlook you are using?
Found a generic video of Outlook versions with the ribbon on how to find the blocked senders list that might be of help?
HEREHERE is a Internet search for how to find blocked senders in Outlook 2016..
If you have a different version you can alter the search parameters to your specific version of Outlook..
If you are using the online outlook (365?), it may be completely different and may or may not have some options..