Hi Friends,

One of our sender try to send an email to our domain but they got bounced
back with this message 451 SPF lookup failure (#4.3.0).

I am running qmailtoaster in centos 6 32 bit.
We are able to send email to this sender but unable to receive it and they
got bounced back email.
Is the issue is our server or their server.
how to fix this
Anyone can help me.



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