What causes iCloud email error 550 5.2.1?
Hi everyone, since yesterday my icloud email has stopped working. Those who write to me receive error 550 5.2.1 and the email bounces, I can't send messages and I can't log in with my account to icloud.com. All other icloud services work properly and support tells me that there are no blocks on my account. Has anyone had the same problem and know what the solution is?
[Re-Titled by Moderator]