您可以在一個域名上發布多條 SPF 記錄嗎？答案是否定的：一個域名一定不能有多條 SPF 記錄，否則 SPF 會失敗並返回永久錯誤（PermError）。
SPF 記錄是位於 DNS 中的 TXT 記錄，準確地以 "v=spf1" 開始，後面跟一系列的 mechanisms 和 modifiers。
SPF 檢查先獲取域名上面的所有以 "v=spf1" 開始的 TXT 記錄：
如果沒有找到記錄，返回 None； 如果找到多條記錄，返回 PermError。比如，如果您有 2 個 TXT 記錄在 yourdomain…
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