Update mailspring to 1.6.2 and build from source
Summarized changelog:
- Mailspring now allows you to RSVP to calendar events directly from your inbox. Messages with .ics attachments or text/calendar mime-parts are displayed in a nice expanded format.
- A new menu option, "Copy Mailbox Permalink", allows you to generate a mailspring:// URL for a thread. Clicking this link from another application opens the thread in Mailspring.
- The composer is faster, more reliable, and uses significantly less RAM over time thanks to a new version of the SlateJS text editor. You can also drag and drop selected text and drag/copy/paste inline images.
- Select-all and copy paste of email message contents now works reliably in all cases.
Full changelog can be found here.