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

问题描述

465 和 587 这两个端口都是用来发送邮件(提交邮件)的，但它们之间的真正区别是什么?

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 (port 465) v. msa (port 587)

端口 465 和 587 用于电子邮件客户端到电子邮件服务器的通信 - 发送电子邮件使用 SMTP 协议.

SMTP protocol: smtps (port 465) v. msa (port 587)

Ports 465 and 587 are intended for email client to email server communication - sending out email using SMTP protocol.

端口 465 用于 smtps
SSL 加密在任何 SMTP 级别通信之前自动启动.

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

端口 587 用于 msa
它几乎就像标准的 SMTP 端口.MSA 应在身份验证后接受电子邮件(例如 SMTP AUTH 后).当 DUL 范围的网络管理员可以阻止 传出 垃圾邮件时，它有助于阻止 传出到 SMTP 端口(端口 25)的强>传出连接.
如果服务器和您的 ISP 支持，SSL 加密可以通过 STARTTLS 命令在 SMTP 级别启动不过滤服务器的 EHLO 回复 (2014 年报道).

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 由 MTA 到 MTA 通信(邮件服务器到邮件服务器)使用.它可以用于客户端到服务器的通信，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"邮箱无需身份验证.

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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