Error transferring to mx1.domain.COM; SMTP Protocol Returned a Permanen

By taidtt ·
Recently,a user cannot send email to this customer, with Delivery Failure report as below:
Error transferring to "mx1.DOMAIN.COM"; SMTP Protocol Returned a Permanent Error 550 failed to meet SPF requirements

He cannot send to this customer only.
Of course, We don't have going out filter.
Lotus 8.0
Barracuda firewall.
Please help me ... !

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