blocks|key|556457|text|SMTP协议:+smtps+(端口465)诉msa+(端口587)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|556458|端口465和587是为电子邮件客户端的电子邮件服务器通信-发送电子邮件使用的协议。|offset|length|style|BOLD|556459|端口465用于smtps|556460|SSL加密是在任何SMTP级别通信之前自动启动的。|556461|端口587用于生活津贴|556462|它几乎类似于标准SMTP端口。MSA应接受认证后的电子邮件。+(例如SMTP+8月份之后)。当范围的netmaster可以阻止到SMTP端口(端口25)的传出连接时，它有助于阻止杜尔传出的垃圾邮件。|556463|如果服务器支持SSL加密，并且您的ISP不支持https://en.wikipedia.org/wiki/Starttls，则可以通过SMTP级别的https://en.wikipedia.org/wiki/Starttls命令启动SSL加密。|556464|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，但目前并不是最推荐的。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。|556465|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Smtps|1|https://en.wikipedia.org/wiki/Mail_submission_agent|2|https://en.wikipedia.org/wiki/Mail_submission_agent#Mandatory_authentication|3|https://en.wikipedia.org/wiki/Dialup_Users_List|4|https://en.wikipedia.org/wiki/Starttls|5|6|https://en.wikipedia.org/wiki/Smtp^0|0|T|2|0|0|5|7|5|0|0|0|0|5|7|4|1|0|1B|1B|F|F|2|2H|2|3|0|N|12|4|22|12|5|0|0|4|1N|4|6|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@$D|1E|E|1F|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1G|8|@$D|1H|E|1I|F|G]]|9|@$D|1J|E|1K|1|1L]]|A|$]]|$1|J|3|K|5|6|7|1M|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1N|8|@$D|1O|E|1P|F|G]]|9|@$D|1Q|E|1R|1|1S]]|A|$]]|$1|N|3|O|5|6|7|1T|8|@$D|1U|E|1V|F|G]]|9|@$D|1W|E|1X|1|1Y]|$D|1Z|E|20|1|21]]|A|$]]|$1|P|3|Q|5|6|7|22|8|@]|9|@$D|23|E|24|1|25]|$D|26|E|27|1|28]]|A|$]]|$1|R|3|S|5|6|7|29|8|@$D|2A|E|2B|F|G]]|9|@$D|2C|E|2D|1|2E]]|A|$]]|$1|T|3|-4|5|6|7|2F|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]|11|$5|W|X|Y|A|$Z|12]]|13|$5|W|X|Y|A|$Z|14]]|15|$5|W|X|Y|A|$Z|16]]|17|$5|W|X|Y|A|$Z|18]]|19|$5|W|X|Y|A|$Z|18]]|1A|$5|W|X|Y|A|$Z|1B]]]]

<h1>SMTP protocol: smtps (port 465) v. msa (port 587)</h1>

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

Port 465 is for <a href="https://en.wikipedia.org/wiki/Smtps" rel="noreferrer">smtps</a> 
SSL encryption is started automatically before any SMTP level communication.

Port 587 is for <a href="https://en.wikipedia.org/wiki/Mail_submission_agent" rel="noreferrer">msa</a> 
It is almost like standard SMTP port.
<a href="https://en.wikipedia.org/wiki/Mail_submission_agent#Mandatory_authentication" rel="noreferrer">MSA should accept email after authentication</a> (e.g. after SMTP AUTH). It helps to stop outgoing spam when netmasters of <a href="https://en.wikipedia.org/wiki/Dialup_Users_List" rel="noreferrer">DUL</a> ranges can block outgoing connections to SMTP port (port 25). 
SSL encryption may be started by <a href="https://en.wikipedia.org/wiki/Starttls" rel="noreferrer">STARTTLS</a> command at SMTP level if server supports it and your ISP does not <a href="http://it.slashdot.org/story/14/11/11/2349244/isps-removing-their-customers-email-encryption" rel="noreferrer">filter server's EHLO reply (reported 2014)</a>.

<hr>

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 <a href="https://en.wikipedia.org/wiki/Smtp" rel="noreferrer">SMTP</a> port accepts email from other mail servers to its "internal" mailboxes without authentication.

blocks|key|1877585|text|587比465|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1877586|这些端口分配是由因特网分配数字管理局(IANA)指定的。|offset|length|style|BOLD|1877587|587港：SMTP邮件提交+(SMTP-MSA)，一种接受电子邮件客户端(MUA)提交电子邮件的服务。在RFC+6409中描述。|unordered-list-item|1877588|465港：用于SSM的URL会议目录(与电子邮件完全无关)|1877589|从历史上看，端口465最初是为SMTPS加密和身份验证“包装器”在SMTP上计划的，但它很快就被取消了(几个月内，15年前)，转而支持STARTTLS+over+SMTP+(RFC+3207)。尽管如此，可能有许多服务器支持废弃的协议包装器，主要是为了支持实现SMTPS的老客户端。除非您需要支持这些老客户端，否则SMTPS及其在端口465上的使用应该只是一个历史脚注。|1877590|令人绝望的混淆和不精确的术语SSL经常用于指示SMTPS包装器和TLS以指示STARTTLS协议扩展。|1877591|完整性:+25港|1877592|第25号港口：Simple+Mail+Transfer+(SMTP-MTA)，一种接受其他服务器(MTA或MSA)提交电子邮件的服务。在RFC+5321中描述。|1877593|资料来源：|1877594|IANA+http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt|1877595|“撤销smtps+TCP端口”-来自互联网邮件联盟主管保罗·霍夫曼的电子邮件，1998年11月12日。|1877596|RFC+6409+-邮件提交|1877597|RFC+5321+-简单邮件传输协议|1877598|RFC+3207+-用于传输层安全的SMTP服务扩展|1877599|RFC+4607+-特定于源的IP多播|1877600|entityMap|0|LINK|mutability|MUTABLE|url|https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=587|1|https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=465|2|https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=25|3|http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt|4|http://www.imc.org/ietf-apps-tls/mail-archive/msg00204.html|5|http://www.rfc-editor.org/rfc/rfc6409.txt|6|http://www.rfc-editor.org/rfc/rfc5321.txt|7|http://www.rfc-editor.org/rfc/rfc3207.txt|8|http://www.rfc-editor.org/rfc/rfc4607.txt^0|0|8|G|0|5|8|0|4|0|0|B|I|0|4|1|0|0|55|0|0|1F|0|0|8|0|0|28|0|6|2|0|0|5|0|0|2M|5|2H|3|0|0|1F|1|D|4|0|0|E|0|E|5|0|0|I|0|I|6|0|0|Q|0|Q|7|0|0|J|0|J|8|0^^$0|@$1|2|3|4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1X|8|@$D|1Y|E|1Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|20|8|@$D|21|E|22|F|G]]|9|@$D|23|E|24|1|25]]|A|$]]|$1|K|3|L|5|J|7|26|8|@$D|27|E|28|F|G]]|9|@$D|29|E|2A|1|2B]]|A|$]]|$1|M|3|N|5|6|7|2C|8|@$D|2D|E|2E|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|2F|8|@$D|2G|E|2H|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|2I|8|@$D|2J|E|2K|F|G]]|9|@]|A|$]]|$1|S|3|T|5|J|7|2L|8|@$D|2M|E|2N|F|G]]|9|@$D|2O|E|2P|1|2Q]]|A|$]]|$1|U|3|V|5|6|7|2R|8|@$D|2S|E|2T|F|G]]|9|@]|A|$]]|$1|W|3|X|5|J|7|2U|8|@$D|2V|E|2W|F|G]]|9|@$D|2X|E|2Y|1|2Z]]|A|$]]|$1|Y|3|Z|5|J|7|30|8|@$D|31|E|32|F|G]]|9|@$D|33|E|34|1|35]]|A|$]]|$1|10|3|11|5|J|7|36|8|@$D|37|E|38|F|G]]|9|@$D|39|E|3A|1|3B]]|A|$]]|$1|12|3|13|5|J|7|3C|8|@$D|3D|E|3E|F|G]]|9|@$D|3F|E|3G|1|3H]]|A|$]]|$1|14|3|15|5|J|7|3I|8|@$D|3J|E|3K|F|G]]|9|@$D|3L|E|3M|1|3N]]|A|$]]|$1|16|3|17|5|J|7|3O|8|@$D|3P|E|3Q|F|G]]|9|@$D|3R|E|3S|1|3T]]|A|$]]|$1|18|3|-4|5|6|7|3U|8|@]|9|@]|A|$]]]|19|$1A|$5|1B|1C|1D|A|$1E|1F]]|1G|$5|1B|1C|1D|A|$1E|1H]]|1I|$5|1B|1C|1D|A|$1E|1J]]|1K|$5|1B|1C|1D|A|$1E|1L]]|1M|$5|1B|1C|1D|A|$1E|1N]]|1O|$5|1B|1C|1D|A|$1E|1P]]|1Q|$5|1B|1C|1D|A|$1E|1R]]|1S|$5|1B|1C|1D|A|$1E|1T]]|1U|$5|1B|1C|1D|A|$1E|1V]]]]

<h1>587 vs. 465</h1>
These port assignments are specified by the Internet Assigned Numbers Authority (IANA):
<ul>
<li><a href="https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=587" rel="noreferrer">Port 587</a>: [SMTP] Message submission (SMTP-MSA), a service that accepts submission of email from email clients (MUAs). Described in RFC 6409.</li>
<li><a href="https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=465" rel="noreferrer">Port 465</a>: URL Rendezvous Directory for SSM (entirely unrelated to email)</li>
</ul>
Historically, port 465 was initially planned for the SMTPS encryption and authentication “wrapper” over SMTP, but it was quickly deprecated (within months, and over 15 years ago) in favor of STARTTLS over SMTP (RFC 3207). Despite that fact, there are probably many servers that support the deprecated protocol wrapper, primarily to support older clients that implemented SMTPS. Unless you need to support such older clients, SMTPS and its use on port 465 should remain nothing more than an historical footnote.
The hopelessly confusing and imprecise term, SSL, has often been used to indicate the SMTPS wrapper and TLS to indicate the STARTTLS protocol extension.
<h3>For completeness: Port 25</h3>
<ul>
<li><a href="https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=25" rel="noreferrer">Port 25</a>: Simple Mail Transfer (SMTP-MTA), a service that accepts submission of email from other servers (MTAs or MSAs). Described in RFC 5321.</li>
</ul>
<h3>Sources:</h3>
<ul>
<li>IANA <a href="http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt" rel="noreferrer">Service Name and Transport Protocol Port Number Registry</a></li>
<li>“<a href="http://www.imc.org/ietf-apps-tls/mail-archive/msg00204.html" rel="noreferrer">Revoking the smtps TCP port</a>” - Email from Internet Mail Consortium director Paul Hoffman, 12 Nov 1998.</li>
<li><a href="http://www.rfc-editor.org/rfc/rfc6409.txt" rel="noreferrer">RFC 6409 - Message Submission for Mail</a></li>
<li><a href="http://www.rfc-editor.org/rfc/rfc5321.txt" rel="noreferrer">RFC 5321 - Simple Mail Transfer Protocol</a></li>
<li><a href="http://www.rfc-editor.org/rfc/rfc3207.txt" rel="noreferrer">RFC 3207 - SMTP Service Extension for Secure SMTP over Transport Layer Security</a></li>
<li><a href="http://www.rfc-editor.org/rfc/rfc4607.txt" rel="noreferrer">RFC 4607 - Source-Specific Multicast for IP</a></li>
</ul>

blocks|key|556784|text|我一直使用端口465。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|556785|丹诺顿的回答已经过时了。正如他和维基百科所说的那样，465号端口最初计划用于SMTPS加密，并在15年前很快被废弃。但是许多ISP仍然在使用端口465，特别是为了遵守RFC+8314当前的建议，这鼓励使用隐式TLS，而不是使用端口587的STARTTLS命令。(见3.3节)。使用端口465是使用充当邮件提交代理(MSA)的SMTP服务器开始隐式安全会话的唯一方法。|offset|length|556786|基本上，RFC+8314建议放弃明文电子邮件交换，并且所有三种常见的IETF邮件协议仅用于隐式TLS会话，以便在可能的情况下保持一致。因此，对于SMTPS、IMAP4S和POP3S，推荐的安全端口分别为465、993和995。|556787|尽管RFC+8314当然允许继续使用带有端口587和STARTTLS命令的显式TLS，但这样做会打开邮件用户代理(MUA，邮件客户端)，使其受到降级攻击，即中间人拦截STARTTLS请求以升级到TLS安全性，但拒绝它，从而迫使会话保持在明文状态。|556788|entityMap|0|LINK|mutability|MUTABLE|url|/a/19942206|1|https://en.wikipedia.org/wiki/SMTPS|2|https://www.rfc-editor.org/rfc/rfc8314|3|https://www.rfc-editor.org/rfc/rfc8314#section-3.3^0|0|0|6|0|G|4|1|2B|8|2|3O|3|3|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]|$D|12|E|13|1|14]|$D|15|E|16|1|17]|$D|18|E|19|1|1A]]|A|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1C|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]|T|$5|M|N|O|A|$P|U]]|V|$5|M|N|O|A|$P|W]]]]

I use port 465 all the time.
The <a href="/a/19942206">answer by danorton</a> is outdated. As he and <a href="https://en.wikipedia.org/wiki/SMTPS" rel="noreferrer">Wikipedia</a> say, port 465 was initially planned for the SMTPS encryption and quickly deprecated 15 years ago. But a lot of ISPs are still using port 465, especially to be in compliance with the current recommendations of <a href="https://www.rfc-editor.org/rfc/rfc8314" rel="noreferrer">RFC 8314</a>, which encourages the use of implicit TLS instead of the use of the STARTTLS command with port 587. (See section <a href="https://www.rfc-editor.org/rfc/rfc8314#section-3.3" rel="noreferrer">3.3</a>). Using port 465 is the only way to begin an implicitly secure session with an SMTP server that is acting as a mail submission agent (MSA).
Basically, what RFC 8314 recommends is that cleartext email exchanges be abandoned and that all three common IETF mail protocols be used only in implicit TLS sessions for consistency when possible. The recommended secure ports, then, are 465, 993, and 995 for SMTPS, IMAP4S, and POP3S, respectively.
Although RFC 8314 certainly allows the continued use of explicit TLS with port 587 and the STARTTLS command, doing so opens up the mail user agent (MUA, the mail client) to a downgrade attack where a man-in-the-middle intercepts the STARTTLS request to upgrade to TLS security but denies it, thus forcing the session to remain in cleartext.

blocks|key|2667303|text|端口465:+IANA已经向该端口重新分配了一个新服务，它不应该再用于通信。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2667304|然而，由于IANA曾经承认它是有效的，所以可能有一些遗留系统只能使用这种连接方法。通常，只有在应用程序需要时才使用此端口。一个快速的谷歌搜索，你会发现许多消费者ISP文章，建议端口465作为建议设置。希望这事能很快结束！它不符合RFC标准。|2667305|端口587:+--这是默认的邮件提交端口。当邮件客户端或服务器提交要由适当的邮件服务器路由的电子邮件时，它应该始终使用此端口。|2667306|每个人都应该考虑默认使用这个端口，除非您的上游网络或主机提供商显式地阻止了您。这个端口，加上TLS加密，将确保电子邮件安全地提交，并遵循IETF制定的指导方针。|2667307|端口25:此端口继续主要用于中继。SMTP中继是将电子邮件从电子邮件服务器传送到电子邮件服务器。|2667308|在大多数情况下，现代SMTP客户端(Outlook、Mail、Thunderbird等)不应该使用这个端口。传统上，它被住宅ISP和云托管提供商屏蔽，以限制从受损的计算机或服务器上转发的垃圾邮件数量。除非您专门管理邮件服务器，否则您的计算机或服务器上不应该有通过此端口的通信量。|2667309|entityMap^0|0|6|0|0|0|6|0|0|0|5|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|Y|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|12|8|@]|D|@]|E|$]]|$1|P|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|Q|$]]

Port 465: 
IANA has reassigned a new service to this port, and it should no longer be used for SMTP communications.

However, because it was once recognized by IANA as valid, there may be legacy systems that are only capable of using this connection method. Typically, you will use this port only if your application demands it. A quick Google search, and you'll find many consumer ISP articles that suggest port 465 as the recommended setup. Hopefully this ends soon! It is not RFC compliant.

Port 587: 
This is the default mail submission port. When a mail client or server is submitting an email to be routed by a proper mail server, it should always use this port.

Everyone should consider using this port as default, unless you're explicitly blocked by your upstream network or hosting provider. This port, coupled with TLS encryption, will ensure that email is submitted securely and following the guidelines set out by the IETF.

Port 25: 
This port continues to be used primarily for SMTP relaying. SMTP relaying is the transmittal of email from email server to email server.

In most cases, modern SMTP clients (Outlook, Mail, Thunderbird, etc) shouldn't use this port. It is traditionally blocked, by residential ISPs and Cloud Hosting Providers, to curb the amount of spam that is relayed from compromised computers or servers. Unless you're specifically managing a mail server, you should have no traffic traversing this port on your computer or server.

blocks|key|1877751|text|我不想说名字，但似乎有人完全错了。参考标准机构声明如下:提交465个tcp消息提交通过TLS协议IESG+2017-12-12+RFC8314。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1877752|如果您有这种倾向，您可能希望阅读参考的RFC。|1877753|这显然意味着端口465是强制加密通信的最佳方式，并确保它已经到位。587港没有这种保证。|1877754|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I don't want to name names, but someone appears to be completely wrong. The referenced standards body stated the following:
submissions 465 tcp Message Submission over TLS protocol [IESG] [IETF_Chair] 2017-12-12 [RFC8314] 

If you are so inclined, you may wish to read the referenced RFC.

This seems to clearly imply that port 465 is the best way to force encrypted communication and be sure that it is in place. Port 587 offers no such guarantee.

blocks|key|556868|text|RFC+8314的发布改变了对这个问题的正确答案。因此，端口465和587都是邮件提交代理(MSA)的有效端口。端口465需要在连接设置时协商TLS/SSL，如果选择协商TLS，端口587使用STARTTLS。对IANA登记处进行了更新，以便为此目的合法使用465号港口。对于邮件中继，只使用端口25，因此STARTTLS是对邮件中继执行TLS的唯一方法。将邮件中继和邮件提交看作两种非常不同的服务是很有帮助的(有许多行为上的差异，比如需要auth、不同的超时、不同的消息修改规则等等)。恰巧使用了类似的有线协议。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|556869|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rfc-editor.org/rfc/rfc8314^0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The correct answer to this question has been changed by the publication of <a href="https://www.rfc-editor.org/rfc/rfc8314" rel="noreferrer">RFC 8314</a>. As a result, port 465 and 587 are both valid ports for a mail submission agent (MSA). Port 465 requires negotiation of TLS/SSL at connection setup and port 587 uses STARTTLS if one chooses to negotiate TLS. The IANA registry was updated to allow legitimate use of port 465 for this purpose. For mail relay, only port 25 is used so STARTTLS is the only way to do TLS with mail relay. It's helpful to think of mail relay and mail submission as two very different services (with many behavior differences like requiring auth, different timeouts, different message modification rules, etc.) that happen to use a similar wire protocol.

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

What is the difference between ports 465 and 587?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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这些端口465和587都用于发送邮件(提交邮件)，但它们之间的真正区别是什么？

问465和587端口之间有什么区别？
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问465和587端口之间有什么区别？EN