A: Make sure Neutron is downloaded and installed from here. Check if e-mail account is listed in Neutron's settings -> Help -> Account. If not, try adding it via OS settings as POP3/IMAP e-mail account. If it does not help, account is already added but Neutron does not see it and Neutron has permission provided to access device accounts, then you could try adding account manually via Help -> Account -> [+]:
For example for 163.com service it would be:
- Address for POP: pop3s://pop.163.com, or for IMAP: imaps://imap.163.com
Also make sure that access to the account via POP/IMAP protocol is enabled in the mail service settings:
- 163.com (use authorization code if password for e-mail account does not work)
- Gmail.com (you will need to enable access for a Less Secure Apps which can be disabled after a license check: http://myaccount.google.com/lesssecureapps)
If Neutron failed to validate (login) the account it will be shown with yellow color in the list. You can disable IMAP/POP3 access for your e-mail account if license check succeeded (when you see red dot on your e-mail account in Help -> Account list). If you reset Neutron's settings you will need to re-do the above steps again.