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Date: Sat,  8 Aug 2026 13:47:50 +0700 (+07)
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<ks.bichtran@gmail.com>: host gmail-smtp-in.l.google.com[173.194.174.27] said:
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    either SPF or DKIM. 550-5.7.26  550-5.7.26  Authentication results:
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    with ip: [150.95.116.136] = did not pass 550-5.7.26  550-5.7.26  For
    instructions on setting up authentication, go to 550 5.7.26
    https://support.google.com/mail/answer/81126#authentication
    41be03b00d2f7-cbe8f1e07cesi5598688a12.109 - gsmtp (in reply to end of DATA
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Arrival-Date: Sat,  8 Aug 2026 13:47:48 +0700 (+07)

Final-Recipient: rfc822; ks.bichtran@gmail.com
Original-Recipient: rfc822;ks.bichtran@gmail.com
Action: failed
Status: 5.7.26
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.26 Your email has been blocked because the
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    [ng-shost103.tenten.vn] with ip: [150.95.116.136] = did not pass 550-5.7.26
    550-5.7.26  For instructions on setting up authentication, go to 550 5.7.26
    https://support.google.com/mail/answer/81126#authentication
    41be03b00d2f7-cbe8f1e07cesi5598688a12.109 - gsmtp

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