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IP Reputation — a receiver's assessment of a sending IP address based on its mail volume, complaint rate, blocklist status, and history of legitimate or abusive traffic.
Deliverability is determined by a combination of SMTP results, IP and domain reputation, list quality, complaints, content, and SPF, DKIM, and DMARC checks. No single metric guarantees inbox placement.
IP Reputation — a receiver's assessment of a sending IP address based on its mail volume, complaint rate, blocklist status, and history of legitimate or abusive traffic.
A receiving server can use this signal when accepting, temporarily deferring, rejecting, or filtering a message. Its weight depends on the recipient’s local policy.
Correlate the SMTP code and rejection text with sending logs, reputation, complaints, and authentication results. Remove invalid addresses and do not retry indefinitely after a permanent failure.
