Moderator, Discovery at Search Engine Watch Forums received an email from Google on how to block his ads from being displayed on Google's Gmail.
By default, most, if not all, emails you received contain ads along the side that are or should be contextual relevant to the content in your email. Here is an example email from our Search Forum Recaps, which you can also subscribe to over here.
What if you, as an advertiser, don't want your ads to be displayed in people's email? Well, in the past, the only real way to exclude those ads from showing in Gmail would be to opt out of Google's whole content network. That is no longer the case.
To stop your ads from displaying in Gmail, you have to go to the Site Exclusion tool and enter in gmail.com as a site you want to exclude in Google's content network.
In addition, you will be able to track these Gmail ads within your Placement Performance Reports.
Forum discussion at Search Engine Watch Forums.