java - 简单的 Java 邮件。无法在 EHLO 中设置本地主机名称(如何设置 mail.smtp.localhost？)

Question

我在程序中使用简单 Java 邮件库 ( http://www.simplejavamail.org )，并且我想设置一个本地主机名称，当我发送电子邮件时，该名称应在 EHLO 中发送。我尝试这样做:

Properties props = new Properties();
props.put("mail.smtp.sendpartial", "true");
props.put("mail.smtp.host", "smtp.mail.ru");
props.put("mail.smtp.localhost", "mail.ru");

Mailer mailer = MailerBuilder
        .withSMTPServer(server, port, login, password)
        .withTransportStrategy(TransportStrategy.SMTPS)
        .withSessionTimeout(10 * 1000)
        .clearEmailAddressCriteria()
        .withProperties(props)
        .withDebugLogging(true)
        .buildMailer();

正如您在代码中看到的那样，我现在应该在 EHLO 中包含“mail.ru”，但它没有发生，我仍然保留着我的计算机的名称。我在日志中看到以下内容:

DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.mail.ru", port 465, isSSL true
220 smtp46.i.mail.ru ESMTP ready (Looking for Mail for your domain? Visit https://biz.mail.ru)
DEBUG SMTP: connected to host "smtp.mail.ru", port: 465

EHLO MyComputersName
250-smtp46.i.mail.ru
250-SIZE 73400320
250-8BITMIME
250-PIPELINING
250 AUTH PLAIN LOGIN XOAUTH2
DEBUG SMTP: Found extension "SIZE", arg "73400320"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "PIPELINING", arg ""
DEBUG SMTP: Found extension "AUTH", arg "PLAIN LOGIN XOAUTH2"
DEBUG SMTP: Attempt to authenticate using mechanisms: LOGIN PLAIN DIGEST-MD5 NTLM 
DEBUG SMTP: AUTH LOGIN command trace suppressed
DEBUG SMTP: AUTH LOGIN succeeded

我做错了什么？如何设置mail.smtp.localhost？

Answer 1

如果启用了 SSL，请尝试 mail.smtps.localhost 或 mail.smtps.localaddress。否则，可以使用 mail.smtp.localhost 或 mail.smtp.localaddress。

在您的情况下，使用了TransportStrategy.SMTPS，这意味着显式启用了SSL，因此用于普通连接的mail.smtp.localhost将不起作用。

下面是我的引用[从 SMTPTransport 类文件粘贴]:

public synchronized String getLocalHost() {
        if(this.localHostName == null || this.localHostName.length() <= 0) {
            ***this.localHostName = this.session.getProperty("mail." + this.name + ".localhost");***
        }

        if(this.localHostName == null || this.localHostName.length() <= 0) {
            ***this.localHostName = this.session.getProperty("mail." + this.name + ".localaddress");***
        }

        InetAddress localHost;
        try {
            if(this.localHostName == null || this.localHostName.length() <= 0) {
                localHost = InetAddress.getLocalHost();
                this.localHostName = localHost.getCanonicalHostName();
                if(this.localHostName == null) {
                    this.localHostName = "[" + localHost.getHostAddress() + "]";
                }
            }
        } catch (UnknownHostException var2) {
            ;
        }

        if((this.localHostName == null || this.localHostName.length() <= 0) && this.serverSocket != null && this.serverSocket.isBound()) {
            localHost = this.serverSocket.getLocalAddress();
            this.localHostName = localHost.getCanonicalHostName();
            if(this.localHostName == null) {
                this.localHostName = "[" + localHost.getHostAddress() + "]";
            }
        }

        return this.localHostName;
}