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Suddenly my mailbox of iCloud is offline in my Mail? I don't think it's anything with the connection, since I have 4 mailboxes and only 1 is offline. How can I get them back online in Mail? I also have problems finding the Apple ID-server everytime I try to log in my iCloud? Not on my iPad or iPhone, only on my Mac-computer?
iMac, macOS Sierra (10.12.6), iPhone 7 (version 10.3.3)
Get help using iCloud Mail - Apple Support
Cheers!If you can't receive mail in the Mail app on macOS
Find the name of your iCloud email account on the left side of the main Mail window. If your account name is dimmed and has a lightning-bolt symbol next to it, your account is offline. To take your account online, connect to the Internet, then choose Mailbox > Take All Accounts Online.
If you still can't receive email, get more help with your Mail app.
See this article If a mailbox is offline in Mail on Mac - Apple Support
Mailbox icloud is offline in my Mail
