Without e-mail, I might not have heard from them. Every Time . Force communication upward. We tend to assume that if the boss isn't saying anything, everything is okay. And yet, nothing could be further from the truth.
Bosses are notoriously poor communicators.
Your boss may be preoccupied and might appreciate your taking the initiative to keep things on track. Say thank you. In April I drove to Ft. Collins to visit two college professors I hadn't seen in 30 years. Both taught me to think critically, to write, and to appreciate words.