Gmail now provides users a set of inboxes that automatically sort messages it deems "Promotions" or "Social" into tabs that are separate from a user's main inbox -- a feature that has implications for e-mail marketing. MailChimp and Return Path have noticed a small decline in open rates, but it is still too soon to determine the full effect. "Our advice is: Don't panic," Constant Contact CEO Gail Goodman said.

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