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rejected e-mail

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flyfishr
flyfishr
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When I try to send an e-mail to my son's gmail account it is blocked saying the sender is unauthenticated. Error message says "Gmail requires all senders to authenticate with either SPF or DKIM." What's the fix for this?

When I try to send an e-mail to my son's gmail account it is blocked saying the sender is unauthenticated. Error message says "Gmail requires all senders to authenticate with either SPF or DKIM." What's the fix for this?

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