SAP Knowledge Base Article - Preview

3769507 - Outbound emails bounced with SMTP 5.7.26 (unauthorized sender)

Symptom

Outbound emails are bounced (SMTP status code 5.7.26) despite relaxed DMARC alignment and maintained DNS records.


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Environment

SAP Service Cloud Version 2

Product

SAP Service Cloud Version 2 all versions

Keywords

smtp 5.7.26, email bounce, unauthenticated sender, spf fail, dkim fail, dmarc alignment, relaxed alignment, outbound email, return-path, mail-from, mta configuration, unauthorized sending ip, receiving domain restrictions, mx txt records, email deliverability , KBA , CEC-CRM-EML , Emails for SAP Sales/Service Cloud , Problem

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