IPhone email sending failure?

When I use my lap top I have no problem emailing this user but when I try on my iPhone it always returns the email back to me with this attached message:
Delivery to the following recipient failed permanently:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Requested action not taken: mailbox unavailable (state 13).

What can I do to fix this? The recipient says they don't have me blocked or anything.

Pl contact your service provider.

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