Businesses depend on email as the glue that pulls marketing tactics together, yet many otherwise-savvy marketers misuse email in a way that ultimately alienates customers. Here are six common blunders. 1. Batch-and-Blast Years ago, one-size-fits-all communications worked fine, and you might well have created one email for everyone and sent it once a week. Though it still happens, it’s no longer the norm now that merchants can take advantage of more sophisticated customer intelligence.