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Specialize Your Content:
A very small amount of your email content should be intended for your subscriber list en masse. Unless you’re producing hyper-targeted content (such as, say, maintenance newsletters for owners of Pontiac Azteks), your subscribers are going to be interested in different things. Use custom fields, email engagement, and good old-fashioned trial and error to place your subscribers on the appropriate lists. Otherwise, you risk losing their engagement and, eventually, your inbox placement...