First paste error messages, search engine-friendly collection, but also to the technology experience this problem friends.
smtp 501 Syntax error (no parameters allowed) (#5.5.4)
Background Description:
Uses TCP to send mail using Sina mailbox Times smtp to send mail out the error (other mailboxes may also exist with the problem), QQ mailbox without the problem.
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Send e-mail is actually very simple, we like to pursue this limit to streamline the people, certainly not willing to use third-party mail plug-ins. Use, structure, code flow, not necessarily in line with my development habits. Examples therefore you have written to send messages via TCP, source address: https: //gitee.com/coodyer/Coody-Framework/tree/original/coody-mail
The screenshot above is a process of sending smtp capture the situation, in fact, only need to establish a connection, then follow the above specification sends the corresponding TCP packets can be.
FIG Code (repaired) (cloud directly download the source code on the code):
Tencent had been using the mailbox, and then when I replace the Sina-mail, and dished out so that I am very silent errors, 501 errors endless.
smtp 501 Syntax error (no parameters allowed) (#5.5.4)From the wrong point of view, the error code is 501, while the error is broken down 5.5.4
When checking SMTP Error Code Description of view:
| 501 5.5.4 | Invalid Address | Invalid IP address |
| If the receiving end mail server is MS Exchange Server 5.5, 2000, 2003 and receive this error message when, | Please contact the receiving end postman attach http://support.microsoft.com/kb/291828. Will be amended Exchange Server. |
Invalid IP address, I repeatedly confirmed letter of host did wrong, smtp.sina.com. Sina-mail address to view the letter, believed to be smtp.sina.com correct.
And the response message transmitted as follows:
220 smtp-2-194.smtpsmail.fmail.yf.sinanode.com ESMTP
250-smtp-2-194.smtpsmail.fmail.yf.sinanode.com 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-STARTTLS 250 8BITMIME 250 smtp-2-194.smtpsmail.fmail.www.baihua178.cn yf.sinanode.com Exception in thread "main" org.coody.framework.mail.exception.MailException: 邮件服务器初始化失败:250 smtp-2-194.smtpsmail.fmail.yf.sinanode.com at org.coody.framework.mail.sender.EmailSender.init(EmailSender.java:57) at org.coody.framework.mail.sender.EmailSender.<www.feishenbo.cn t>(EmailSender.java:34) at org.coody.framework.mail.sender.EmailSender.main(EmailSender.java:129)So use QQ mailbox to send the message again, walkthroughs normal response content:
220 smtp.qq.com Esmtp QQ Mail Server
250 smtp.qq.com
220 Ready to start www.lafei6d.cn 334 VXNlcm5hbWU6 334 UGFzc3dvcmQ6 235 Authentication successful 250 Ok 250 Ok 354 End data with <CR><LF>.<CR><LF> 250 Ok: queued as Found that first line,
QQ邮箱：220 smtp.qq.com Esmtp QQ Mail Server
新浪邮箱：220 smtp-2-194.smtpsmail.fmail.yf.sinanode.com ESMTP
这是我们在建立socket连接后，发送HELO(EHLO)前服务器返回的信息。
通过测试发现，原因很简单，当我们连上socket（smtp）发信服务器后
服务器重新指定了特定的esmtp地址(或者对我们来说，叫做别名更合适吧)
故此，我们发送HELO(EHLO)时，键入的smtp，必须是服务器指定的esmtp标识
220 smtp-2-194.smtpsmail.fmail. www.qiaoheibpt.com .sinanode.com ESMTP
250-smtp-2-194.smtpsmail.fmail.yf.sinanode.com
250-AUTH LOGIN PLAIN
250-AUTH=LOGIN PLAIN
250-STARTTLS
250 8BITMIME
250 smtp-2-194.smtpsmail.fmail.yf.sinanode.com
Exception in thread "
www.huizhonggjpt.cn
" org.coody.framework.mail.exception.MailException: 邮件服务器初始化失败:250 smtp-2-194.smtpsmail.fmail.yf.sinanode.com
at org.coody.framework.mail.sender.EmailSender.init(www.jiuhuaylgw.cn EmailSender.java:57)
at org.coody.framework.mail.sender.EmailSender.<init>(www.xinyueylzc.cn EmailSender.java:34)
at org.coody.framework.mail.sender.EmailSender.main(www.tengyao3zc.cn EmailSender.java:129)
于是使用QQ邮箱发送一遍邮件，走查正常的响应内容：
220 smtp.qq.com Esmtp www.lafei6v.cn Mail Server
250 smtp.qq.com
220 Ready to start TLS
334 VXNlcm5hbWU6
334 UGFzc3dvcmQ6
235 Authentication successful
250 Ok
250 Ok
354 End data with <CR><LF>.www.shentuylzc.cn <CR><LF>
250 Ok: queued as
于是：
不出意外，当我们看到了 250 ok queue id 85626825952741 的响应，结果并没有太大意外。我们成功收到了邮件
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注：鄙人并不了解邮件服务器的协议规范，纯属跟随tcp包进行模拟，如有解说不正确的地方，专业人员可指出并修改。鄙人只是苦于在网上找不到相关技术资料，故此将鄙人的解决方案记录在此，送给碰到此问题的朋友们。