GMX/WEB.DE temporary reputation deferral

Exact response pattern421 4.7.0 Please try again later

TemporaryGMX/WEB.DEReputation

What it means

GMX or WEB.DE is temporarily deferring traffic based on reputation, rate or system conditions.

Likely causes

New sender.
High connection rate.
Authentication or DNS weakness.

Recommended response

Reduce traffic.
Verify PTR, SPF and DKIM.
Use normal retries and monitor acceptance.

Operational rule: Preserve the complete SMTP response, remote hostname, sending IP, envelope sender and timestamp. Never diagnose from the three-digit code alone.

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Browse all SMTP errors Decode a bounce