Related Questions:
Does the email integration connect with Outlook?
Will ET email connect with my provider?
Answer:
Gmail and Google Apps
Microsoft Exchange (ActiveSync) and Microsoft Office365
Microsoft Exchange (Exchange Web Services)
Microsoft Exchange (Graph)
Microsoft Exchange
Outlook.com
Yahoo! Mail
iCloud (aka MobileMe or DotMac)
IMAP. We are not able to read encrypted email providers such as ProtonMail
A custom account syncing using generic IMAP
Nylas
Other known IMAP providers
AOL Mail
FastMail
GandiMail
GMX
Mail.ru
Yandex.Mail
GoDaddy Mail
Hover.com
Namecheap
Bluehost
Soverin
Zimbra
123-reg
126
QQ Mail
Aliyun (Alibaba Group)
NetEase 163 (China)
Yeah.net
139.com (China)
Deprecated providers
IMAP-based Outlook.com