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MC 0.387 · 6 Nov 2026, 20:47 EST

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Article · Microsoft 365
554 5.2.2 mailbox full Error
Encountering a 554 5.2.2 mailbox full error can disrupt email communication. This SMTP error occurs when the recipient's mailbox reaches its storage limit, preventing further message delivery.
Kaveendra DhilhanMay 20, 20245,8621,000

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Server response Email delivery issue Mailbox full Message rejection SMTP error

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