When comparing Nylas Mail vs Mailspring, the Slant community recommends Nylas Mail for most people. In the question“What are the best native e-mail clients for Linux?” Nylas Mail is ranked 7th while Mailspring is ranked 8th.
Ranked in these QuestionsQuestion Ranking
Pro Beautiful UI
Pro Open Source
Pro Has introduced features that are not available in better-known apps
Like a 'new generation' app - quite a revelation in simple addition of various emails from separate providers with different forms of password/2-step/other verification and sign ins - all failed by many better known apps on this list.
Pro Unified inbox
Using a single inbox for all of your email accounts helps you get more done in less time. Mailspring supports every major mail provider—Gmail, iCloud, Office 365, Outlook.com, Yahoo!, and IMAP/SMTP—so you have a single, streamlined command center for all your messages.
Pro CPU / battery efficient
Mailspring uses a C++ sync engine designed to be as efficient as possible, so you can leave the app running and not see your laptop battery life drain away.
Pro Snoozing support
You can swipe to archive / snooze messages and specify when you'd like them to resurface in your inbox.
Pro Read receipts and link tracking
Activity tracking is built into Mailspring so you get notified as soon as contacts read your messages and can follow up appropriately.
Con High memory usage
Hige CPU and GPU usage for a mail client. Some computers may struggle and be slowed down by it.
Con Weak support
Bug fixes take too long to be released.
Con Custom IMAP accounts can not sync
Con High CPU usage
Con Pro subscription model
To use some features, like contact profiles and link tracking more than a few times a month, you need to pay for a Pro subscription.