Sendmail:
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet.
en.wikipedia.org
Sendmail:
Sendmail是一種多用途、支援多種協定的跨網路電子郵件傳送代理軟體，由艾瑞克·歐曼（Eric Allman）所開發，於1983年隨著BSD 4.1c首次發行。
zh.wikipedia.org
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SendmailSendmail