This article will guide you in order to enable SMTP Authentication on your iPhone
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Select “Settings” from your home screen
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Select “Mail, Contacts, Calendar”
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Select your email address
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Select “SMTP” under the “Outgoing Mail Server” section
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Select the “Primary Server”
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Ensure “Authentication” is set to “Password”
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Ensure hostname is set to “mail.yourdomain.com>”
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Ensure the port is set to 587
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Ensure SSL is switched “Off”
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Enter the username (Your full email address)
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Enter the mailbox password -> Done