you can decrease your spf setting, I set mine to '1'.

http://wiki.qmailtoaster.com/index.php/Spf

 * 0: Never do SPF lookups, don't create Received-SPF headers
 * 1: Only create Received-SPF headers, never block
 * 2: Use temporary errors when you have DNS lookup problems
 * 3: Reject mails when SPF resolves to fail (deny)
 * 4: Reject mails when SPF resolves to softfail or fail
 * 5: Reject mails when SPF resolves to neutral, softfail, or fail
 * 6: Reject mails when SPF does not resolve to pass


On 6/29/2019 7:51 AM, ChandranManikandan wrote:
Hi Eric,

Do i need to do any settings in SPF on our server or sender issue.
Still the client send the below error message and unable to deliver our server.
Is it our server issue or client server error?
Please help me?

    **********************************************
       **      THIS IS A WARNING MESSAGE ONLY      **
       **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
       **********************************************

    The original message was received at Thu, 27 Jun 2019 05:39:46 GMT
    from aserp2120.xxx.com <http://aserp2120.oracle.com/> [127.0.0.1]

      ----- Transcript of session follows ----- ... while talking to
    our server.com <http://server.com>.:

                MAIL From:<sen...@yyy.com
                <mailto:stephen.pil...@oracle.com>> SIZE=8301

    <<< 451 SPF lookup failure (#4.3.0)
    <ourser...@xxxx.net <mailto:h...@panasiagroup.net>>.. Deferred:
    451 SPF lookup failure (#4.3.0)
    Warning: message still undelivered after 4 hours Will keep trying
    until message is 5 days old


On Fri, Jun 28, 2019, 5:54 PM ChandranManikandan <kand...@gmail.com <mailto:kand...@gmail.com>> wrote:

    Hi Eric, Biju,

    thanks for your advise.

    My spftbehaviour setting is 3 in my server.

    On Thu, Jun 27, 2019 at 9:34 PM Eric Broch
    <ebr...@whitehorsetc.com <mailto:ebr...@whitehorsetc.com>> wrote:

        What's your SPF setting in /var/qmail/control/spfbehavior?

        On 6/27/2019 3:14 AM, ChandranManikandan wrote:
        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.


-- */Regards,
        Manikandan.C
        /*



-- */Regards,
    Manikandan.C
    /*

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