When comparing Canary Mail vs Nine - Exchange ActiveSync, the Slant community recommends Nine - Exchange ActiveSync for most people. In the question“What are the best e-mail clients for Android? ” Nine - Exchange ActiveSync is ranked 8th while Canary Mail is ranked 20th.
Specs
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Pros
Pro Multiple Signatures for Multiple Accounts including ALIASES
You can assign your default signature to an ALIAS for the same account or create an altogether new one.
Pro No personal data stored on servers
No access tokens, passwords, attachments or email itself is stored on Canary servers.
Pro Seamlessly integrates with iOS verion
Gone are the days of manual setup of phone email clients! Canary Mail syncs not just your accounts but all of your settings and even signatures on iCloud.
Pro Local email database is encrypted on disk
Canary stores your local email database encrypted.
Pro Gorgeous and intuitive
Pro Pretty Good Privacy or PGP built-in
Pro Really fast
Pro Great UI
The stack approach is one of this apps strongest points, as it provides the fastest access to mail and is the cleanest to sort through.
Pro Incredible feature set
Calendar, contacts, notes, tasks.
Pro Many widgets
Pro Very reliable
Cons
Con Missing mainstream features
No functionality for user-defined Gmail message-tagging, or moving/copying to IMAP folders. Might be acceptable in a free app, but not in one with premium pricing.
Con Buggy
It adds random pins to old emails which then stay on top of the inbox list
Con Poor handling of new emails
You sometimes need to wait very long before your email actually gets delivered.
Con Windows moves randomly
When you create a new email, the new windows is often misplaced so that you have to move it to reach the "Send" button.
Con Poor text editing capabilities
The cursor is laggy so you're better off using keyboard shortcuts.
Con Show NO show
It'll show a new email on a counter, but you're not able to view them.
Con Doesn't support Gmail or Yahoo
Supported servers include
Exchange Server 2003 SP2/SP3 and above
Office 365
Hotmail
Outlook.com
Google Apps account
Although many basic servers are supported, it makes no sense that some of the most popular ones would be left out.
Con Overpriced
At $9.99 (down from $20), they are priced much higher than their competition.