Fix Mail Error: Cannot Send……Recipient Rejected by Server Because User is Unknown

While I was sending an Email to my friends, it says “recipient rejected by server because the user is unknown”. But now, I fixed it. Here I am going to tell you the Solution.
Step 1: Go to “Settings”.
Step 2: Tap “Mail, Contacts, calendars”.emails-image

Step 3: Open your Email account.
Step 4: Click “Account”. Then scroll down and choose  “Outgoing Mail server”.
Step 5: Click “SMTP”. Then click on “Primary Server”.
Step 6: Enter your “User Name and Password” (optional) under “Outgoing Mail server”.user-name
Step 7: Finally, click “Done” in the upper right corner for your changes.

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