I chanced upon this interesting study on internal communications which talks of e-mail clutter on page 8.
While this is an issue with many organizations, I guess we try to find other media to communicate and sometimes fail to address the timing of the communication itself.
From what I hear Intel does a good job internally to find out which time works best for opening and reading mail communication.
So maybe next time, it would make sense to plug in a question on ‘timing’ in your employee communication survey to get a fair idea of what works. I am aware that most employees prefer to read long, important mailers just after lunch time or during the team break period.
Maybe, your organization has a different employee time cycle?