Avoid the Morning Inbox Purge
Avoid the morning purge. The first thing people do in the morning when checking email is to delete about half of all the unread emails in their inbox. All of the stuff they are subscribed to that they just don’t feel they have the time to review first thing in the morning in their rush to get going. Don’t send your emails first thing in the morning… wait until after that first purge. Where possible better control this by individual time zone.