Marsedit seems very good. Using a trial version from their website (30 days)
Trying Ulysses at the moment which posts but doesn’t seem to allow any housekeeping of past posts. Note I have a legacy version and not the current subscription based model which is not worth the money to me.
Marsedit is likely to make a sale, it’s in the Apple App Store, but always worth checking websites, it’s a lot cheaper bought direct.
Still waiting to see if this blog lark is for me.
Despite being well within the free trial period, exchanged a couple of emails with the author of the programme and decided to buy. Tried most options and as far as I can see this programme is the best for both posting and editing existing posts.