| 单词 | SMTP Service Extensions | 
| 释义 | SMTP Service Extensions学习怎么用 权威例句SMTP Service ExtensionsSMTP Service ExtensionsSMTP Service ExtensionsSimple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)SMTP Service Extension for 8bit-MIMEtransportSMTP Service Extension for Message Size DeclarationSMTP Service Extension for Message Size DeclarationSMTP Service Extension for 8-bit MIME TransportSMTP Service Extensions for Transmission of Large ...SMTP Service Extension for Returning Enhanced Error Codes | 
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