docker-smtp：SMTP docker容器

smtprelay 简单的基于Golang的SMTP中继/代理服务器，该服务器通过SMTP接收邮件并将其直接转发到另一个SMTP服务器。 为什么要使用另一台SMTP服务器？ 外发邮件通常通过SMTP发送到MTA（邮件传输代理），在大多数情况下，MTA是UNIX / Linux上的Postfix，Exim，Sendmail或OpenSMTPD之一。 您真的不希望自己设置和维护这些功能完备的厨房水槽，因为它们很复杂，易碎且难以配置。 我的用例很简单。 我需要通过csmtp / sSMTP / dma将来自cron的自动生成的邮件，来自各种服务和网络打印机的邮件发送到GMail，而又不将我的GMail凭据泄露给每个生成邮件的设备。 主要特点 支持SMTPS / TLS（465），STARTTLS（587）和未加密的SMTP（25） 检查发送方，接收方，客户端IP 带有文件的身份验证支持

Free SMTP Server is a free SMTP server program for Windows that lets you send email messages directly from your computer. Along with a mass mailer the program can be used as a relay server for sending newsletters, distributing messages to different mailing lists, sending notifications to your customers, as well as for sending personalized messages. You can use it instead of ISP's SMTP server to increase your privacy. Free SMTP Server supports all email programs like Outlook Express and Eudora, but best optimized to work with 1st Mass Mailer mass mailer. The email program you already use for sending and receiving messages can be connected to the server in a very easy way - by using the word "localhost" instead of your current SMTP host. Having done so, you can send messages in a usual manner. Free SMTP Server is very fast, while sending, it establishes dozens of SMTP connections, and gets the most out of your Internet connection. Free SMTP Server is able to send thousands of emails per minute with a regular DSL Internet connection. The user interface of the program is very easy to learn, excellent documentation is included. The program is freeware so there is no reason not to download and try it!

用MFC编写的SMTP服务器端的源代码！

实现一个简单的SMTP服务器，允许标准的客户端，如outlook express发送邮件: （1）给出协议的交互日志。 （2）保存显示客户端发送邮件内容（显示客户端发送的文字和图片）。 （3）支持多用户。 （4）使用c系列语言进行实现。