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Re: Sending Email
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Re: Sending Email


  • Subject: Re: Sending Email
  • From: Lucas Holt <email@hidden>
  • Date: Mon, 11 Jul 2005 19:34:20 -0400

It has nothing to do with your java code. Its the DNS config and possibly the smtp server. Not you.

1. Tell the bone head sys admin to setup the PTR and A records for your server correctly. (DNS)
2. Make sure you are allowed to relay with that username/password or by ip address.


The reason its happening is because many mail servers think that mail coming from an ip without a PTR record is automatically a spammer. (comes up forged in the headers or errors) In fact, sendmail has had this feature for a long time. I believe its called PICKY_HELLO_CHECK. It can cut some spam as many spammers use ips that don't belong to them or send from loop back etc.

To explain further, a PTR record is a DNS record that translates an IP address to a name.. i.e 17.254.0.91 will translate to 91.0.254.17.in-addr.arpa which happens to be an akami server for www.apple.com. Another example would be

nslookup 216.55.178.45
Note:  nslookup is deprecated and may be removed from future releases.
Consider using the `dig' or `host' programs instead.  Run nslookup with
the `-sil[ent]' option to prevent this message from appearing.
Server:         192.168.0.2
Address:        192.168.0.2#53

Non-authoritative answer:
45.178.55.216.in-addr.arpa      name = mail.foolishgames.com.

Authoritative answers can be found from:
178.55.216.in-addr.arpa nameserver = ns1.abac.com.
178.55.216.in-addr.arpa nameserver = ns2.abac.com.


As you can see, my mail server's reverse lookup (PTR) is mail.foolishgames.com and if you nslookup mail.foolishgames.com it resolves to the same ip address. In this case, my hosting company has to manage the DNS record because they own the ips. IP addresses can only be subleased some many times and eventually they can't delegate the DNS to you. At least thats what i've been told in the past. Either way its whoever gave you the ips for the server's fault. Most hosting companies will fix this for you for free.


Luke

On Jul 11, 2005, at 1:26 PM, Gino Pacitti wrote:

Hi LD

This is the class I am using and I load from a Properties file the smtp host, username and password..

Does this clarify the set up?



public static boolean send(String subject, String to, String from, String body) {
// these will be obtained from the Properties file
String mailHost = ((String)System.getProperties ().getProperty("mailHost"));
String mailSender = ((String)System.getProperties ().getProperty("mailSender"));
String mailPwd = ((String)System.getProperties().getProperty ("mailPwd"));


if ((from != null) && (to != null) && (subject != null) && (body != null)) {
try {
//Get system properties
Properties props = System.getProperties();
//Specify the desired SMTP server
props.put("mail.smtp.host", mailHost);
props.put("mail.smtp.auth", "true");
// create a new Session object
javax.mail.Session session = javax.mail.Session.getInstance(props,null);
// create a new MimeMessage object (using the Session created above)
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO, new InternetAddress[] { new InternetAddress(to) });
message.setRecipients(Message.RecipientType.BCC, new InternetAddress[] { new InternetAddress ((String) System.getProperties().getProperty("toAddress")) });
message.setSubject(subject);
message.setContent(body, "text/plain");
message.setSentDate(new Date());
message.saveChanges();


Transport transport = session.getTransport("smtp");
transport.connect(mailHost,mailSender,mailPwd);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
return true;
}
catch (Throwable t) {
// t.printStackTrace();
System.err.println("SMTP: " + t);
return false;
}
}
return false;
}


On 11 Jul 2005, at 18:19, LD wrote:


Hi there,

On 12/07/2005, at 3:04 AM, Gino Pacitti wrote:



I have a class that utilizes:
javax.mail.*;
javax.mail.internet.*;
classes and has worked great until now.

I recently set up an xserve in a data centre and the ISP is handling the DNS etc...
But when I send through to the clients mail server using the correct mailserver, username and password I get this error:


javax.mail.SendFailedException: 550 5.7.1 <the email address to send to>... Relaying denied. IP name possibly forged [217.149.110.33]



The relay error seems to pop its head up when you're attempting to smtp via a network you're not a part of.
Are you sending via the ISP's smtp?


with regards,
--

LD





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Lucas Holt
email@hidden
________________________________________________________
FoolishGames.com  (Jewel Fan Site)
JustJournal.com (Free blogging)
FoolishGames.net (Enemy Territory IoM site)

Think PC.. in 2006 you can own an Apple PCintosh. Whats next, windows works?

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References: 
 >Sending Email (From: Gino Pacitti <email@hidden>)
 >Re: Sending Email (From: LD <email@hidden>)
 >Re: Sending Email (From: Gino Pacitti <email@hidden>)

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