How to get an email when package was successfully built?

Dear all,

I've registered an open source project on Launchpad. Then I upload source code to Launchpad, and the source code will be compiled into deb packages.

If the packages cannot be built, I will receive an email. However, if the packages are built successfully, I will not receive any email at all.

My question is, I want to receive an email when the packages are successfully built. How to do that?

Thank you very much!