TUHH mail accounts have specific storage limits. You can usually check your current usage within the SOGo interface (often displayed in the bottom left corner) or via the TUHH User Self-Service portal Empty the Trash & Sent Folders:

: You can usually see your current usage percentage at the bottom left of the SOGo web interface. Suggested Post for TUHH Students/Staff Headline: ⚠️ Heads up: TUHH Webmail (SOGo) Quota Limits

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