常見問題：電子郵件的錯誤訊息

下列是一些常見的錯誤訊息與說明：

• 554 5.7.1 Service unavailable
• Greylisted for [number] seconds
• Sasl_rate_limit per %
• Blocked you may be infected
• Blocked using sbl-xbl.spamhaus.org
• Reject for policy reason. RULE1_1
• Reject for policy reason. RULE2_1
• Reject for policy reason. RULE2_2
• Reject for policy reason. RULE3_1
• Reject for policy reason. RULE3_2
• Relay Access Denied