If you have Mozilla commit access, and your username corresponds to an email address which no longer works, you will have missed important emails about signing the new Mozilla Committer’s Agreement. This means

your commit access may go away at any time

(don’t make me turn on ‘blink’) which would be bad. If this is you, contact me, and then follow these instructions, remembering to note on your submitted form the username of your account. And perhaps also file a bug on IT on updating your username.