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SMTP Error 452 4.2.2: Mailbox full

Warning↻ Retryable · exponential backoffNetwork

TL;DR · 10-second read

The recipient's mailbox is over quota. Soft bounce: retry later, and suppress the address if it keeps bouncing for several days.

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What you see · exact log / response

452-4.2.2 The recipient's inbox is out of storage space. Please direct the
452-4.2.2 recipient to
452 4.2.2  https://support.google.com/mail/?p=OverQuotaTemp - gsmtp

Fix

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Copy-paste fixes for 452 4.2.2 are in the enrichment queue

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Last verified 2026-10-13 · Source: RFC 5321 reply codes + RFC 3463 enhanced status codes (IANA registry) · Official docs ↗ · ~2,900 searches/mo