[global-string] supports Gmail, Yahoo, Office 365, Outlook / Hotmail / Live, AOL, and iCloud; as well as many other IMAP providers. Using the Other Email setting, providers such as Yandex, Mail.ru, GMX, mail.com, Hushmail, Zoho, Web.de, QIP, and ramble are all able to be set up in [global-string].
[global-string] constantly adds new providers, so stay tuned.