Really easy to use. There were some minor issues that were not related to ReachInbox but to Zoho mail. For example I did not see my incoming emails in OneBox but that was because the name of the Inbox in Zoho was not "Inbox" but something else, they changed that and then it worked! Another thing that did not work out of the box was the unsubscribe header because Zoho did not support that, but I can have the manual button in my email. The response from support was very fast and solved both things very quickly. It's really easy to set up multiple campaigns and use variables in your emails. Tested it and have no issues.