Email campaign management programs and ESPs are not all created equal, and not all actually do what they say they can regarding results, deliverability etc.
However, email service providers are far from solely responsible for deliverability, although many marketers still seem to think so.
Actually, email marketers themselves play an important role in protecting their inbox delivery rates. In order to boost your deliverability, email clickthroughs and conversions, here are some tips and insights.