iPad Email Rejected By Server Does Not Allow Relaying

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• Step 1:
  Switch on your iPad device.
• Step 2:
  Navigate to the Settings option.
• Step 3:
  Tap the Mail, Contacts, Calendar option.
• Step 4:
  Choose your email account from the list.
• Step 5:
  Tap Account--Outgoing Mail Server--SMTP--Primary Server.
• Step 6:
  You need to enter your username and password in the Outgoing Mail Server section, though this is optional.
• Step 7:
  Tap the Done option at the top-right corner of the screen. This should fix the issue.