I've been using Lightmeter for a few months now, a...

I've been using Lightmeter for a few months now, and it has significantly improved my email deliverability. The interface is intuitive and the analysis of email headers is thorough. It has helped me pinpoint and fix deliverability issues, resulting in better inbox placement. The customer support team is also responsive and helpful. I highly recommend Lightmeter to anyone serious about maximizing their email deliverability.