When comparing Postbox vs Newton, the Slant community recommends Postbox for most people. In the question“What is the best desktop Email client for Windows 10?” Postbox is ranked 5th while Newton is ranked 19th.
Ranked in these QuestionsQuestion Ranking
Pro Clear interface
Pro Forgotten attachment reminders by default
Reminding the user that they forgot to attach the file if they mentioned one in the body of the email is one of the most useful features of any email client and so many don't include this. Postbox is pre-configured to look for certain keywords (attached, CV, spreadsheet, pdf etc) and you can specify your own keywords in addition.
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.
Pro Know who's emailing you
Newton grabs information from LinkedIn, Facebook, and Twitter accounts linked to the sender's email address. It then displays information which can help you figure out who the emailer is, such as their job title and where they work.
Pro Snooze incoming emails
You can snooze emails to come back at a convenient time - whether it be in 2 hours, or next Wednesday.
Pro Works across multiple platforms
While there is no Windows app, Newton is available on iOS, Android, and macOS, including Android Wear and Apple Watch.
Pro Logs messages to Salesforce
Pro Had everything you can dream of
Con No support forum
Support for paid product has no online forums.
Con Subscription based
Newton costs $49.99 per year after the 14 day free trial.
Con It's "stupid expensive"
$49.99/year? Really? And it doesn't cook, clean, or serve beer. There are better email apps for far less money.