When comparing Inky vs Postbox, the Slant community recommends Postbox for most people. In the question“What are the best e-mail clients for Windows?” Postbox is ranked 8th while Inky is ranked 15th. The most important reason people chose Postbox is:
Has the ability to block tracking gifs commonly used for read receipts.
Specs
Question Ranking
Pros
Pro Blocks tracking gifs
Has the ability to block tracking gifs commonly used for read receipts.
Pro One Inbox for all accounts
All messages in one place. But you can select to show only messages from each account either.
Pro Quick Bar for macros
Quick bar allows you to add a variety of content to your message. It will let you reuse URLS in your Sent folder, and autocompletes against canned responses, signatures, and topics.
Cons
Con Poor customer service
Developers changed their business model to the subscription based completely unanounced. Consequently, customers who hadn't logged in for a while could no longer access their account and remove their data. HQ rarely answer emails from users who have issues.
Con Not stable
Sometimes it stops working as it should be.
Con Inadequate editing tools
No font selection, size or color. Can't paste an image to send. No table builder, etc.
Con No support forum
Support for paid product has no online forums.
Con Way too expensive
Currently the price is at 45€ (US $40). That's ridiculous for an E-Mail client. The design alone is pretty but neither does that or the functionality in any way justify the pricing.