将"SmtpClient.EnableSsl"设置为true的"System.Net.Mail.SmtpClient"需要哪些端口? [英] What ports does a 'System.Net.Mail.SmtpClient' need with 'SmtpClient.EnableSsl' set to true?

问题描述

如标题所示，将"SmtpClient :: EnableSsl"设置为true的"System :: Net :: Mail :: SmtpClient"需要哪些端口?

As the title says, what ports does an 'System::Net::Mail::SmtpClient' need with 'SmtpClient::EnableSsl' set to true?

EnableSsl属性上的文档说，替代连接方法的默认端口为465，但未提及支持支持的连接类型所使用的端口.

The documentation on the EnableSsl property says the default port for an alternative connection method is 465 but doesn't mention what's used for the connection type it does support.

编辑-如果有所作为，则在这种情况下我将连接到Gmail，但欢迎使用通用答案.

Edit - If it makes a difference, I'm connecting to Gmail in this instance but generic answers would be welcome.

推荐答案

对Wireshark的快速测试表明，答案默认为端口25

A quick test with Wireshark suggested that the answer is port 25 by default

客户端使用STARTTLS重新使用最初未加密的链接以随后发送加密的数据.

The client uses STARTTLS to re-use an initially unencrypted link to subsequently send encrypted data.

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