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Sendy is not a big corporation who outsource support to somewhere remote. Questions are usually answered by me @Ben.
I especially understand how frustrating it is to ask a question and having to wait days before getting a response. I usually reply immediately when I see a question, even on weekends. I care about my users and want it to work for them should they encounter any problems.
We make sure things work before releasing anything. But Sendy is a self hosted software, server environments are different and certain behaviours are unexpected. Though, more than 97% of users have no problems running it from day one. If you do have problems, don't get upset, I will personally find out why and resolve it for you.