Otherwise, your email might not get delivered or it might get sent to the recipient's Junk folder. * If you use a non-iCloud SMTP server, don't use your iCloud email address as a 'Send From' address. You should also ask your recipient to contact their email administrator. Use your Apple ID or create a new account to start using Apple services. If your recipient still doesn't receive your message, but your message was sent without any alerts or “undelivered mail” messages, your message might be blocked or filtered by the iCloud Mail servers or the recipient's mail server. Sign in to iCloud to access your photos, videos, documents, notes, contacts, and more.Ask the recipient to check their Junk mail folders or mailboxes. Access your Me.com Apple iCloud Account from an Email Program using IMAP Me.com Apple iCloud provides IMAP access to your Me.In Outlook Web App, on the toolbar, select Settings > Mail > POP and IMAP. For help signing in, see Sign in to Outlook Web App. If you see the message in your Outbox, make sure that you're connected to the Internet and use the steps above to select iCloud as the outgoing mail account.* Sign in to your account using Outlook Web App.I found the detailed settings in another answer and have verified that they match suggested settings. If you see an unsent copy of the message in Drafts, try to send it again. go into the Microsoft mail client account section click configure the iCloud email account click on change mailbox sync settings and the Email sync option is turned off when I turn it back on, click DONE, and click SAVE it turns off again.If you use macOS Mail or access your iCloud Mail using Safari or another supported web browser, check your Drafts, Sent, and Outbox mailboxes:.It may also be referred to as a POP, POP3, or IMAP server. If an “unknown address” or “undelivered mail returned” message appears in your Inbox after you send a message, go to your Sent mailbox and make sure that the recipient's email address is correct. The server that stores this mail and then sends it to your inbox is called an incoming mail server.

Icloud incoming mail server