The Sender ID (SID) stamp is based on the sender policy framework (SPF) that authorizes the use of domains in e-mail.是什么意思_The Sender ID (SID) stamp is based on the sender policy framework (SPF) that authorizes the use of domains in e-mail.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句