【正文】
可以很簡單地通過 tel程序來測試一個 SMTP服務(wù)器。 ? SMTP是一個相對簡單的基于文本的協(xié)議。在其之上指定了一條消息的一個或多個接收者(在大多數(shù)情況下被確認(rèn)是存在的),然后消息文本會被傳輸。 SMTP使用 TCP端口 25。在其之上指定了一條消息的一個或多個接收者(在大多數(shù)情況下被確認(rèn)是存在的),然后消息文本會被傳輸。第五級 樣例文本 A ? Gemmi Cong 精美 PPT模板盡在如下豆單 ? ? 歡迎大家欣賞和下載 樣例文本 A ? Gemmi Cong 精美 PPT模板盡在如下豆單 ? ? 歡迎大家欣賞和下載 樣例文本 B ? Simple Mail Transfer Protocol (SMTP) is an Inter standard for electronic mail () transmission across Inter Protocol (IP) works. SMTP was first defined by RFC 821 (1982, eventually declared STD 10),[1] and last updated by RFC 5321 (2022)[2] which includes the extended SMTP (ESMTP) additions, and is the protocol in widespread use today. SMTP is specified for outgoing mail transport and uses TCP port 25. The protocol for new submissions is effectively the same as SMTP, but it uses port 587 instead. SMTP connections secured by SSL are known by the shorth