When comparing Boxer vs Mail, the Slant community recommends Boxer for most people. In the question“What are the best Gmail clients for iOS?” Boxer is ranked 6th while Mail is ranked 9th. The most important reason people chose Boxer is:
Swipe a message to the left to archive, swipe right to place it in a to-do list.
Specs
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Pros
Pro Swipe actions
Swipe a message to the left to archive, swipe right to place it in a to-do list.
Pro Supports Gmail labels
Boxer has Gmail labels fully supported.
Pro Integrates with other services
There's Dropbox and Box support for cloud storage, LinkedIn and Facebook support for social profiling, Evernote support for notes, etc.
Pro Quick-responses
Click the 'quick' button below when composing a message to put a prewritten snippet of text inside the email. There's a set of ready-made solutions, but you can add your own.
Pro Allows "liking" messages
You can automatically send a quick message of appreciation to the sender by clicking like.
Pro Combined inbox
Boxer uses a combined inbox for all your accounts.
Pro Reminders
Pro Supports Push in Gmail
Mail finally supports Push for Gmail accounts in iOS 11
Pro Comes pre-installed on all iOS devices
No need to go out and install another app from the App Store.
Pro Integrates with iOS search
You can use spotlight to search through emails.
Cons
Con Some emails on iPad have excess padding
iPad version adds padding to text that can't be overridden and it can mess up the layout of the email.