从亚马逊服务器发送电子邮件时出现javax.mail异常

Question

I have a simple standalone java class that sends out the emails. I'm using javax.mail to send my emails.

When I run the class on Window machine it is working fine. When I ran the same class on Amazon Server it is giving below exceptions:

Exception in thread "main" javax.mail.MessagingException: Could not connect to SMTP  host: smtpout.secureserver.net, port: 25, response: 554
554 *.phx3.secureserver.net  ESMTP No Relay Access Allowed From xxx.xxx.xxx.xxx

I tried to find help online. for eg by execution below command

nc -z -v smtpout.secureserver.net 25
Connection to smtpout.secureserver.net 25 port [tcp/smtp] succeeded!

Please help me.

Thanks in advance.

Answer 1

It seems you are trying to use the server smtpout.secureserver.net to send mail to an address not hosted by that server, asking the server to relay that mail.

Since services like that are used by spammers to hide behind, nearly all servers block this, unless the server knows you, either because you are in his network (which you are not), or because you authenticate yourself.

I don't know why it worked with your windows machine. Maybe you were in the local network of that server, maybe the server is run by your ISP.

Here is an example on how to use smtp authentication: http://www.rgagnon.com/javadetails/java-0538.html

Of course you need an user and password for the server, you have to talk to whoever runs that server for that.