465和587端口有什么区别? [英] What is the difference between ports 465 and 587?

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问题描述

这些端口 465 587 都用于发送邮件(提交邮件),但它们之间有什么真正的区别?

These ports 465 and 587 are both used for sending mail (submitting mail) but what is the real difference between them?

推荐答案

SMTP协议:smtps(端口465)v。msa(端口587)



端口465和587旨在用于电子邮件客户端发送电子邮件服务器通信 - 发送电子邮件。

端口465 适用于 smtps

SSL加密在任何SMTP之前自动启动

Port 465 is for smtps
SSL encryption is started automatically before any SMTP level communication.

587端口是针对 msa

它几乎像标准的SMTP端口。
MSA应在认证后接受电子邮件 (例如之后SMTP AUTH)。当 DUL 范围的网站管理员可以阻止传出时,它有助于阻止传出垃圾邮件连接到SMTP端口(端口25)。

SSL加密可能由 STARTTLS 命令在SMTP级别,如果服务器支持它,您的ISP不过滤服务器的EHLO回复(报告2014)

Port 587 is for msa
It is almost like standard SMTP port. MSA should accept email after authentication (e.g. after SMTP AUTH). It helps to stop outgoing spam when netmasters of DUL ranges can block outgoing connections to SMTP port (port 25).
SSL encryption may be started by STARTTLS command at SMTP level if server supports it and your ISP does not filter server's EHLO reply (reported 2014).

端口25 被MTA用于MTA通信(邮件服务器到邮件服务器)。它可以用于客户端到服务器通信,但目前不是最推荐的。标准 SMTP 端口接受来自其他邮件服务器的电子邮件到其内部邮箱而不进行身份验证。

Port 25 is used by MTA to MTA communication (mail server to mail server). It may be used for client to server communication but it is not currently the most recommended. Standard SMTP port accepts email from other mail servers to its "internal" mailboxes without authentication.

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