I've been looking for a decent LTD on a mail service provider for a while. I missed Moosend, Sendfox is nice for basic stuff but a bit simple for many things, and others such as Vbout look good, but not for my use case (affiliate marketing to opted-in subscribers).

So Acumbamail came at a good time. It's a little bit raw around the edges, and there's a bit of assumed knowledge, but if you already know your way around an email campaign (such as setting up DKIM and SPF records) then you'll be fine. There are occasionally bits of content which haven't been translated from Spanish to English, but nothing which has hindered me (so far).

The two KILLER features which you might not expect in a low cost or LTD product are automation (allowing sequences to be set up and run), and MULTIPLE domains and lists, thus allowing campaigns to be set up across different brands.

The subscription forms and landing pages seem to work well (a great time saver if you don't need to tailor them exactly to brand), and from the tests undertaken so far the deliverability is great.