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Emails get rejected because of SPF check

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  • Podium78
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    Dear All,
    I have mail server (Fedora/Sendmail) recently some emails sent to our customers get rejected and we receive error MSGs (553 Sender Policy Framework (SPF) fail) , the strange thing is that when I check our domain name in network-tools and toolbox and other sites they show that our domain is clear and no problem with SPF also when I send email to these clients directly from our webmail, they receive the emails only if we send using outlook it get rejected, our smtp is the smtp of our ISP.

    Thank you very much in advance

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