java - Android javamail 501 5.5.4 无效参数

Question

我正在尝试使用 Mailgun 发送电子邮件。根据 mailgun，我使用以下代码:

public static void TestMail() throws Exception
{

            Properties props = System.getProperties();
            props.put("mail.smtps.host","smtp.mailgun.org");
            props.put("mail.debug", "true");
            props.put("mail.verbose", "true");
            props.put("mail.smtps.auth","true");
            Session session = Session.getInstance(props, null);
            Message msg = new MimeMessage(session);
            msg.setFrom(new InternetAddress("fromaddress@gmail.com"));
            msg.setRecipients(Message.RecipientType.TO,
                    InternetAddress.parse("toaddress@gmail.com", false));
            msg.setSubject("Hello");
            msg.setText("Testing some Mailgun awesomness");
            msg.setSentDate(new Date());
            SMTPTransport t =
                    (SMTPTransport)session.getTransport("smtps");
            t.setStartTLS(true);
            t.connect("smtp.mailgun.com", "postmaster@sandbox86837*********.mailgun.org", "b071d**********");
            t.sendMessage(msg, msg.getAllRecipients());
            System.out.println("Response: " + t.getLastServerResponse());
            t.close();


}

我正在使用从以下位置下载的 javamail api:https://code.google.com/p/javamail-android/downloads/list

现在在调试中显示以下信息:

DEBUG: JavaMail version 1.4.1
DEBUG: not loading file: /system/lib/javamail.providers
DEBUG: java.io.FileNotFoundException: /system/lib/javamail.providers: open failed: ENOENT (No such file or directory)
DEBUG: not loading resource: /META-INF/javamail.providers
 DEBUG: not loading resource: /META-INF/javamail.default.providers
DEBUG: failed to load any providers, using defaults

DEBUG: not loading resource: /META-INF/javamail.default.address.map
DEBUG: !anyLoaded
DEBUG: not loading resource: /META-INF/javamail.address.map
DEBUG: not loading file: /system/lib/javamail.address.map
 DEBUG: java.io.FileNotFoundException: /system/lib/javamail.address.map: open failed: ENOENT (No such file or directory)
DEBUG: failed to load address map, using defaults
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun Microsystems, Inc.,1.4.1]
DEBUG SMTP: useEhlo true, useAuth true


DEBUG SMTP: trying to connect to host "smtp.mailgun.com", port 465, isSSL true
220 ak47 ESMTP ready
DEBUG SMTP: connected to host "smtp.mailgun.com", port: 465
EHLO
501 5.5.4 Invalid argument
 HELO
501 5.5.4 Invalid argument

我不知道这个错误意味着什么？当我用谷歌搜索时，没有人指出错误的确切原因或原因。可能是 ssl 或者我的系统缺少一些 java 库？或者我下载的java lib不正确。

但是正如您在调试中看到的那样，它能够成功连接到 smtp.mailgun.com。那为什么会出现这个错误呢？请帮助我。

谢谢

Answer 1

您要连接的服务器要求 HELO 或 EHLO 的参数是主机名或 IP 地址。

您的代码似乎也没有发送。

RFC(RFC2821第29页)似乎有些含糊...

...the client SHOULD send an IP address if no hostname is available

如果这是一项要求，则应使用“必须”一词。但 HELO/EHLO 的语法描述似乎表明该参数是必需的。

第 3.6 节(关于域):

• The domain name given in the EHLO command MUST BE either a primary host name (a domain name that resolves to an A RR) or, if the host has no name, an address literal as described in section 4.1.1.1.