Can't save attachments  better than default mail client I've been Using k-9 for years. Overall it does a decent job. It doesn't allow html signatures and more recently the setting for sending mail as Outlook style or Gmail styles won't switch. On my new Galaxy S7 Edge it's now stuck on Gmail style and puts my signature at the very bottom of all email replies. Unfortunately this is enough for me uninstall.
May 10 2016