GMAIL
Google does not allow IMAP access for accounts without 2-Step Verification.
Please enable 2-Step Verification on your Google account and use an App Password.
How to turn on 2-Step Verification: https://support.google.com/accounts/answer/185839.
You can create App Password at https://myaccount.google.com/ -> Security -> Signing in to Google -> App Passwords
Finally set IMAP server ‘imap.gmail.com‘ with Port 993 and enter your email and your app password.
ICLOUD
Select as IMAP server ‘imap.mail.me.com‘ with Port 993 and enter your email without ‘@icloud.com’ and your iCloud password or app specific password from https://appleid.apple.com/account/manage
OUTLOOK
Server: imap-mail.outlook.com / Port: 993
Finally enter your email address and your Microsoft Account password or an App Password when you have Two-Step Authentication enabled for your Microsoft Account
OFFICE365.COM
Server: outlook.office365.com / Port: 993
Note: If the above settings are not working for your account, then login into the outlook web app, go to the “Settings” > “Options” > “Account” > “My Account” > “Settings for POP and IMAP Access”.
Finally enter your email address and your Microsoft Account password or an App Password when you have Two-Step Authentication enabled for your Microsoft Account
HOTMAIL
Server: outlook.office365.com / Port: 993
Finally enter your email address and your Microsoft Account password or an App Password when you have Two-Step Authentication enabled for your Microsoft Account
YAHOO Mail
Server: imap.mail.yahoo.com / Port 993
Finally enter your email address and your Yahoo! password or an App Password when you have Two-Step Verification enabled for your Yahoo! Account.
AOL.com
Server: imap.aol.com / Port: 993
Finally enter your AOL or AIM screen name (so without @aol.com or @aim.com behind it) and your AOL password.
AT&T
Server: imap.att.yahoo.com / Port: 993
Mail.com
Server: imap.mail.com / Port: 993. More info: https://support.mail.com/pop-imap/toggle.html
GMX.com
Server: imap.gmx.com / Port:993