Multiple dependant projects generate one email

I have 4 projects which comprise a larger project.
1) Compile code
2) test code in one environment
3) test code in second environment
4) package up all the code for deployment

steps 2 and 3 take place on two different machines and happen at the same time.

Currently I send an email with the status of each step, pass/fail.

I would like one email, that indicates the overall status of the build.

So if the compile fails, one emails is sent,

if step 2 fails, and step 3 passes one email


if step 2 passes and step 3 fails, one email


if step 2 and step 3 both fail, one email

and lastly if step 4 fails, there is one email.

if step 4 passes, one email is sent with an overall success.

my question is how to handle the situation in bold font?

Can anyone offer a suggestion?  Notification rules just don't go deep enough for this


Thanks,