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Knowledge Base & Operational DocumentationWhy Do Some Recipients Get Email While Others See a Delivery Delay?
11/10/2026
Different recipient providers can apply different throttling and reputation checks. A delayed message may be queued or temporarily deferred even while other destinations accept mail.
What to check
Review the full delivery log and SMTP response for affected recipients, sending volume, SPF/DKIM/DMARC alignment, reverse DNS, and recent DNS changes. Do not infer delivery from the sender’s Sent folder.
Recommended next step
Correct authentication or reputation issues and retry only according to the receiving server’s response. Informatix Systems can diagnose business email and DNS delivery problems.