Being using Acumbamail for several months and the service simply doesn't work as it should. List management is fine, mail editing is ok and campaign sending options are decent, but the service simply doesn't work.
Most of the times the emails don't go through gmail and hotmail inboxes, which account for 95% of my email database. Sometimes they go to spam, but most of the times they are completely banned, not even in spam. I did clean my mailing list, I did a lot of optimization. I even get a 99% delivery success in other platforms, then Acumbamail returns the same 99% delivery success, but then only independent email addresses list the mail as open. Not a single mail arrives to GMail and Hotmail inboxes.