Update icloud.md for Custom Email Domain

_providers/icloud.md

@@ -21,3 +21,8 @@ website: https://www.icloud.com/mail
 ---
 
 To use Delta Chat with your iCloud email address [it is required to generate a specific password for it](https://support.apple.com/en-us/HT202304). Afterwards you can use Delta Chat with your iCloud email address and the newly created password.
+
+When using a Custom Email Domain hosted on iCloud+ you need to: 
+- fill in the address you want to use for Delta Chat in the "E-Mail Adress" field,
+- fill in your iCloud login email in "Advanced > IMAP Login Name" and "Advanced > SMTP Login Name", and
+- fill "Advanced > IMAP Server" with "imap.mail.me.com" and "Advanced > SMTP Server" with "smtp.mail.me.com".