SENDING BULK MAIL in JAVAMAIL

I'm trying to send 5000+ emails per session... Each email is personalized. what would be the best way to send each mail?
performance is somewhat critical...
currently, i create one session, then create Message for each email, stuff the variables, then send them one by one...
how about creating a stack of Message (with individual Sessions) and then send them one by one? is there a limit on how many Messages i can create on a single session?
thanks in advance...
dave..

Creating one session as compared to two is quite a bit faster when dealing with 5000+emails. If you have each invidual session doesn't that mean you have to open close a Transport each time? If the way you have now works, why do you want to change it? As for a limit of how many Messages, there isn't one as long as your mail server doesn't mind you sending that many at one time. Anyone please feel free to correct me if I am wrong.

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How to bypass proxy when trying to send a mail using javamail smtp

Hi,
I am trying to make a servlet send a mail using javamail smtp protocol on port 25 but i m not able to send getting an exception, i suspect proxy is blocking, so any idea anyone how bypass a proxy.

And if it does turn out that there's a proxy server blocking access to your target SMTP server, the best way to deal with that is to discuss the issue with the person responsible for your network configuration.

Send bulk mails to a set of addresses

Hi,
I need to start my coding with the independent tool notification engine. So I need to do a bit R & D into writing an application which sends bulk mails to a set of addresses (could be in thousands).So how to send mails to addresses so that the system does not hog, nor should it long time to send such mails.
Any one got the solution, please help me.
Thanks
Ramya

Hi,
As Martin mentioned, you can use transport rule to achieve your requirement ,
The following screenshot for you reference:
Thanks.
Niko Cheng
TechNet Community Support

Send bulk mail in oracle apps 11i with pdf/Xls attachment

hi,
I have a task how can i send bulk emails in one go ( aprrox 150-200 emails in one go) in oaracle apps 11 with attachment pdf/xls
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Duplicate post.
how to send bulk mail in oracle apps 11i with pdf/Xls attachment
Re: how to send bulk mail in oracle apps 11i with pdf/Xls attachment

Send THAI mail using JavaMail to Lotus Notes (URGENT)

Hi all
I experienced the problem when I try to use Javamail to send mail that contains THAI text to Lotus Notes . When I read my mail in Lotus Note,I cannot read it !! . What should I do ?
Please suggest .
Regards
Chairat Tiajanpan
E-Mail : [email protected]

� hello!
Do you know how can I do it? I am desesperated. Please help me.
I want to send a mail to lotus notes using a Java class.
What i need to install in my computer for running the class??
Sorry for my english. I am spanish and i speak english very bad.
Thanks!!

How to send bulk mail in oracle apps 11i with pdf/Xls attachment

hi,
how to send bulk emails in one go ( aprrox 150-200 emails in one go) with attachment pdf file in oracle apps 11i
thanks

I'd use BI Publisher (XML Publisher) Bursting.
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Gareth
http://garethroberts.blogspot.com
http://www.virtuate.com

Getting error when sending SMTP mail using javamail api

hi all
i am new to javamail api...and using it first-time....i'v used the following code
<%
String mailHost="mail.mastsale.com";
String mailText="Hello this is a test msg";
String to="<a href="mailto:[email protected]">[email protected]</a>";
String subject="jsp test mail";
try
String from="<a href="mailto:[email protected]">[email protected]</a>";
String mailhost = "mail.mastsale.com";
Properties props = System.getProperties();
props.put("mail.smtp.host", mailhost);
// Get a Session object
Authenticator auth = new SMTPAuthenticator( "<a href="mailto:[email protected]">[email protected]</a>", "abcd" );
Session session1 = Session.getInstance(props,auth);
//Session.setDebug(true);
//construct message
Message msg = new MimeMessage(session1);
msg.setFrom(new InternetAddress(from,"Your Name"));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
msg.setSubject(subject);
msg.setText(mailText);
//msg.setHeader("X-Mailer",mailer);
msg.setSentDate(new Date());
msg.saveChanges();
//Send the message
out.println("Sending mail to " + to);
Transport.send(msg);
catch (MessagingException me)
out.println("Error in sending message for messaging exception:"+me);
%>
and
SMTPAuthenticator.java
import java.io.*;
import java.util.*;
import java.lang.*;
import javax.mail.*;
import javax.mail.internet.*;
public class SMTPAuthenticator extends javax.mail.Authenticator {
private String fUser;
private String fPassword;
public SMTPAuthenticator(String user, String password) {
fUser = user;
fPassword = password;
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(fUser, fPassword);
Now getting error as: Error in sending message for messaging exception:javax.mail.SendFailedException: Invalid Addresses; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550-(host.hostonwin.com) [208.101.41.106] is currently not permitted to relay 550-through this server. Perhaps you have not logged into the pop/imap server 550-in the last 30 minutes or do not have SMTP Authentication turned on in your 550 email client.
Can anyone help me?

i got the following error while using the below code,
-----------registerForm----------------
DEBUG: setDebug: JavaMail version 1.3.2
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
::::::::::::::::::::::::::::::::: Error : <HR> javax.mail.AuthenticationFailedException <HR>
-----------registerForm----------------
public class SendMailBean {
public String send(String p_from, String p_to, String p_cc, String p_bcc,
String p_subject, String p_message, String p_smtpServer,String FilePath) {
String l_result = "";
// Name of the Host machine where the SMTP server is running
String l_host = p_smtpServer;
//for file attachment
String filename = FilePath;
// Gets the System properties
Properties l_props = System.getProperties();
// Puts the SMTP server name to properties object
l_props.put("mail.smtp.host", l_host);
l_props.put("mail.smtp.auth", "true");
// Get the default Session using Properties Object
Session l_session = Session.getDefaultInstance(l_props, null);
l_session.setDebug(true); // Enable the debug mode
try {
MimeMessage l_msg = new MimeMessage(l_session); // Create a New message
l_msg.setFrom(new InternetAddress(p_from)); // Set the From address
// Setting the "To recipients" addresses
l_msg.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(p_to, false));
// Setting the "Cc recipients" addresses
l_msg.setRecipients(Message.RecipientType.CC,
InternetAddress.parse(p_cc, false));
// Setting the "BCc recipients" addresses
l_msg.setRecipients(Message.RecipientType.BCC,
InternetAddress.parse(p_bcc, false));
l_msg.setSubject(p_subject); // Sets the Subject
// Create and fill the first message part
MimeBodyPart l_mbp = new MimeBodyPart();
//123
///////l_mbp.setText(p_message);
l_mbp.setContent(p_message,"text/html");
// Create the Multipart and its parts to it
Multipart l_mp = new MimeMultipart();
 //l_mp.setContent(html,"text/html");
l_mp.addBodyPart(l_mbp);
// Add the Multipart to the message
l_msg.setContent(l_mp,"text/html");
// Set the Date: header
l_msg.setSentDate(new Date());
//added by cibijaybalan for file attachment
 // attach the file to the message
//Multipart l_mp1 = new MimeMultipart();
 if(!filename.equals(""))
 String fname = filename;
 MimeBodyPart mbp2 = new MimeBodyPart();
 FileDataSource fds = new FileDataSource(fname);
 mbp2.setDataHandler(new DataHandler(fds));
 mbp2.setFileName(fds.getName());
 l_mp.addBodyPart(mbp2);
 // add the Multipart to the message
 l_msg.setContent(l_mp);
//ends here
 l_msg.setSentDate(new java.util.Date());
// Send the message
Transport.send(l_msg);
// If here, then message is successfully sent.
// Display Success message
l_result = l_result + "Mail was successfully sent to : "+p_to;
//if CCed then, add html for displaying info
//if (!p_cc.equals(""))
//l_result = l_result +"CCed To : "+p_cc+" ";
//if BCCed then, add html for displaying info
//if (!p_bcc.equals(""))
//l_result = l_result +"BCCed To : "+p_bcc ;
//l_result = l_result+" <HR>";
} catch (MessagingException mex) { // Trap the MessagingException Error
// If here, then error in sending Mail. Display Error message.
l_result = l_result + " Error : <HR> "+
""+mex.toString()+" <HR>";
} catch (Exception e) {
// If here, then error in sending Mail. Display Error message.
l_result = l_result + " Error : <HR> "+
""+e.toString()+" <HR>";
e.printStackTrace();
}//end catch block
//finally {
System.out.println(":::::::::::::::::::::::::::::::::"+l_result);
return l_result;
} // end of method send
} //end of bean
plz help me

Trying to send e-mail using JavaMail, JBoss 5, and JNDI

Hello there,
Am using JBoss 5.1.0GA and JDK 1.5.0_19 on OS X Leopard.
Created a working SendMailServlet.
Have now decided to refactor it into two separate classes (extract out JavaMail code to a separate class and create a ServletController).
Am also trying to use JNDI to access the connection properties in the mail-service.xml configuration file residing in JBoss.
The Mailer class contains the reusable functionality needed to send an e-mail:
public class Mailer {
 private Session mailSession;
 protected void sendMsg(String email, String subject, String body)
 throws MessagingException, NamingException {
 Properties props = new Properties();
 InitialContext ictx = new InitialContext(props);
 Session mailSession = (Session) ictx.lookup("java:/Mail");
// Session mailSessoin = Session.getDefaultInstance(props);
 String username = (String) props.get("mail.smtps.user");
 String password = (String) props.get("mail.smtps.password");
 MimeMessage message = new MimeMessage(mailSession);
 message.setSubject(subject);
 message.setRecipients(javax.mail.Message.RecipientType.TO,
 javax.mail.internet.InternetAddress.parse(email, false));
 message.setText(body);
 message.saveChanges();
 Transport transport = mailSession.getTransport("smtps");
 try {
 transport.connect(username, password);
 transport.sendMessage(message, message.getAllRecipients());
 Logger.getLogger(this.getClass()).warn("Message sent");
 finally {
 transport.close();
}The MailController class serves as a standard Java Servlet which invokes the Mailer.class's sendMsg() method:
public class MailController extends HttpServlet {
 /** static final HTML setting for content type */
 private static final String HTML = "text/html";
 myapp/** static final HTML setting for content type */
 private static final String PLAIN = "text/plain";
 public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 doPost(request, response);
 public void doPost(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 response.setContentType(PLAIN);
 PrintWriter out = response.getWriter();
 String mailToken = TokenUtil.getEncryptedKey();
 String body = "Hello there, " + "\n\n"
 + "Wanna play a game of golf?" + "\n\n"
 + "Please confirm: https://localhost:8443/myapp/confirm?token="
 + mailToken + "\n\n" + "-Golf USA";
 Mailer mailer = new Mailer();
 try {
 mailer.sendMsg("[email protected]", "Golf Invitation!", body);
 out.println("Message Sent");
 catch (MessagingException e) {
 e.printStackTrace();
 catch (NamingException e) {
 e.printStackTrace();
}Have the mail configuration set under $JBOSS_HOME/server/default/deploy/mail-service.xml:
<server>
<mbean code="org.jboss.mail.MailService" name="jboss:service=Mail">
 <attribute name="JNDIName">java:/Mail</attribute>
 <attribute name="User">user</attribute>
 <attribute name="Password">password</attribute>
 <attribute name="Configuration">
 <configuration>
 <property name="mail.store.protocol" value="pop3"/>
 <property name="mail.transport.protocol" value="smtp"/>
 <property name="mail.user" value="user"/>
 <property name="mail.pop3.host" value="pop3.gmail.com"/>
 <property name="mail.smtp.host" value="smtp.gmail.com"/>
 <property name="mail.smtp.port" value="25"/>
 <property name="mail.from" value="[email protected]"/>
 <property name="mail.debug" value="true"/>
 </configuration>
 </attribute>
 <depends>jboss:service=Naming</depends>
</mbean>
</server>web.xml (Deployment Descriptor):
<servlet>
 <servlet-name>MailController</servlet-name>
 <servlet-class>com.myapp.MailController</servlet-class>
</servlet>
<servlet-mapping>
 <servlet-name>MailController</servlet-name>
 <url-pattern>/sendmail</url-pattern>
</servlet-mapping>This is what is outputted when I start JBOSS and click point my browser to:
https://localhost:8443/myapp/sendmail
[MailService] Mail Service bound to java:/Mail
[STDOUT] DEBUG: JavaMail version 1.4ea
[STDOUT] DEBUG: java.io.FileNotFoundException:
/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/lib/javamail.providers
(No such file or directory)
[STDOUT] DEBUG: !anyLoaded
[STDOUT] DEBUG: not loading resource: /META-INF/javamail.providers
[STDOUT] DEBUG: successfully loaded resource: /META-INF/javamail.default.providers
[STDOUT] DEBUG: getProvider() returning
javax.mail.Provider[TRANSPORT,smtps,com.sun.mail.smtp.SMTPSSLTransport,Sun Microsystems, Inc]
[STDOUT] DEBUG SMTP: useEhlo true, useAuth false
[STDOUT] DEBUG SMTP: trying to connect to host "localhost", port 465, isSSL true
[STDERR] javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 465;
nested exception is:
 java.net.ConnectException: Connection refused
[STDERR] at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
[STDERR] at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
[STDERR] at javax.mail.Service.connect(Service.java:275)
[STDERR] at javax.mail.Service.connect(Service.java:156)
[STDERR] at javax.mail.Service.connect(Service.java:176)
[STDERR] at com.myapp.Mailer.sendMsg(Mailer.java:45)
[STDERR] at com.myapp.MailController.doPost(MailController.java:42)
[STDERR] at com.myapp.MailController.doGet(MailController.java:26)Why am I getting this java.net.ConnectException: Connection refused exception?
Happy programming,
Mike
Edited by: mwilson72 on Aug 21, 2009 4:49 PM

Hi Peter,
Nice to hear from you again!
Per your advice, this is what my mail-service.xml config file looks like now:
<?xml version="1.0" encoding="UTF-8"?>
<server>
<mbean code="org.jboss.mail.MailService" name="jboss:service=Mail">
<attribute name="JNDIName">java:/Mail</attribute>
<attribute name="User">user</attribute>
<attribute name="Password">password</attribute>
<attribute name="Configuration">
 <configuration>
 <property name="mail.store.protocol" value="pop3"/>
 <property name="mail.transport.protocol" value="smtps"/>
 <property name="mail.smtp.starttls.enable" value="true"/>
 <property name="mail.smtps.auth" value="true"/>
 <property name="mail.user" value="user"/>
 <property name="mail.pop3.host" value="pop3.gmail.com"/>
 <property name="mail.smtp.host" value="smtp.gmail.com"/>
 <property name="mail.smtps.port" value="465"/>
 <property name="mail.from" value="[email protected]"/>
 <property name="mail.debug" value="true"/>
 </configuration>
 </attribute>
 <depends>jboss:service=Naming</depends>
</mbean>
</server>Now, when I restart JBoss and point my browser to:
https://localhost:8443/myapp/sendmail
I get this exception:
[STDOUT] DEBUG SMTP: useEhlo true, useAuth true
[STDOUT] DEBUG SMTP: useEhlo true, useAuth true
[STDOUT] DEBUG SMTP: trying to connect to host "localhost", port 465, isSSL true
[STDERR] javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 465;
nested exception is:
 java.net.ConnectException: Connection refused
[STDERR] at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
[STDERR] at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
[STDERR] at javax.mail.Service.connect(Service.java:297)
[STDERR] at javax.mail.Service.connect(Service.java:156)
[STDERR] at javax.mail.Service.connect(Service.java:176)
[STDERR] at com.myapp.Mailer.sendMsg(Mailer.java:45)
[STDERR] at com.myapp.MailController.doPost(MailController.java:42)
[STDERR] at com.myapp.MailController.doGet(MailController.java:26)Does anyone know what I am possibly doing wrong? Is it my code or is it the config file?
-Mike

How to send bulk mails

hai,
i am developing a email application in java.
i need to send mail to bulk members..how do i achieve it.
all members in the mail should not know the other member mailid...how to do that.
if any one can guide me and if source is provided..that will be help full..
my mailid: [email protected]
with regards,
ashok

use this two programs
import javax.mail.*;
import java.util.*;
import javax.mail.internet.*;
class Mail{
     Session session;
     public Mail(){
          Properties p = System.getProperties();
          p.put("mail.smtp.host","earthlink.net");
          session = Session.getDefaultInstance(p,null);
     public void sendMail(String to){
          try{
               MimeMessage mm = new MimeMessage(session);
               mm.setFrom(new InternetAddress("[email protected]"));
               mm.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
               mm.setSubject("Java Mail using Java Stored Procedure");
               mm.setText("This mail is transported by Java Mail, and the back end used is Oracle 9i");
               Transport.send(mm);
          }catch(MessagingException me){
               me.printStackTrace();
import java.util.Properties;
import java.sql.*;
import javax.mail.*;
import javax.mail.internet.*;
public class BulkMailExample {
public static void main (String args[]) throws Exception {
     Connection con = null;
     Statement stmt = null;
     ResultSet rs = null;
    try{
         Class.forName("oracle.jdbc.driver.OracleDriver");
    }catch(java.lang.Exception e){
         e.printStackTrace();
    try{
         con = DriverManager.getConnection("jdbc:oracle:thin:scott/tiger@localhost:1521:ksenji");
         stmt = con.createStatement();
         rs = stmt.executeQuery("select toAddress from sendMail");
         System.out.println("sending Mail");
         Mail m = new Mail();
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              m.sendMail(rs.getString(1));
              System.out.println("Mail Sent");
    }catch(SQLException ex){
         ex.printStackTrace();
    finally{
         try{
              rs.close();
              stmt.close();
              con.close();
         }catch(SQLException ex){
              ex.printStackTrace();
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Sending bulk mail

I am writing a program to send mails to 10k mail ids. My SMTP server provider has set a limit of 100 mails per hour for sending emails which is not sufficient for me. Can anybody provide me a solution?
Does anybody know a public SMTP server without any send limit? Your help on this will be much appreciated.

Um, so, you're looking for a free public mail server that will let you spam as many
people as you want? Gee, I sure hope you don't find one!
If you have a legitimate need to send mail to 10000 people, you're going to need
to pay for it.

Getting exceptions while sending mail using javamail api

Hi to all
I am developing an application of sending a mail using JavaMail api. My program is below:
quote:
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
public class sms
public static void main(String args[])
try
String strstrsmtserver="smtp.bol.net.in";
String strto="[email protected]";
String strfrom="[email protected]";
String strsubject="Hello";
String bodytext="This is my first java mail program";
sms s=new sms();
s.send(strstrsmtserver,strto,strfrom,strsubject,bodytext);
catch(Exception e)
System.out.println("usage:java sms"+"strstrsmtpserver tosddress fromaddress subjecttext bodyText");
System.exit(0);
public void send(String strsmtpserver,String strto,String strfrom ,String strsubject,String bodytext)
try
java.security.Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
Properties p=new Properties(System.getProperties());
if(strsmtpserver!=null)
p.put("mail.transport.protocol","smtp");
p.put("mail.smtp.host","[email protected]");
p.put("mail.smtp.port","25");
Session session=Session.getDefaultInstance(p);
Message msg=new MimeMessage(session);
Transport trans = session.getTransport("smtp");
trans.connect("smtp.bol.net.in","[email protected]","1234563757");
msg.setFrom(new InternetAddress(strfrom));
msg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(strto,false));
msg.setSubject(strsubject);
msg.setText(bodytext);
msg.setHeader("X-Mailer","mtnlmail");
msg.setSentDate(new Date());
Transport.send(msg);
System.out.println("Message sent OK.");
catch(Exception ex)
System.out.println("here is error");
ex.printStackTrace();
It compiles fine but showing exceptions at run time.Please help me to remove these exceptions.I am new to this JavaMail and it is my first program of javamail.Please also tell me how to use smtp server.I am using MTNL 's internet connection having smtp.bol.net.in server.
exceptions are:
Here is exception
quote:
Javax.mail.MessagingException:Could not connect to SMTP host : smtp.bol.net.in, port :25;
Nested exception is :
Java.net.ConnectException:Connection refused: connect
At com.sun.mail.smtp.SMTPTransport.openServer<SMTPTransport.java:1227>
At com.sun.mail.smtp.SMTPTransport.protocolConnect<SMTPTransport.java:322>
At javax.mail.Service .connect(Service.java:236>
At javax.mail.Service.connect<Service.java:137>
At sms.send<sms.java:77>
At sms.main<sms.java:24>

Did you find the JavaMail FAQ?
You should talk to your ISP to get the details for connecting to your server.
In this case I suspect your server wants you to make the connection on the
secure port. The FAQ has examples of how to do this for GMail and Yahoo
mail, which work similarly. By changing the host name, these same examples
will likely work for you.

How to Send biulk mail for 20,000 people with out blocking the mail server

Hi .......... ALL
I am developing a News module in our project, for this have to write code to send everyday news for 20,000 mail Ids
I Developed a code that can send to one Id or multiple.
Weather this type of mail sending treated as spam mail or blocking the mail server i did not know, any of one can please help me.
If this type is not suitable then what is way to send bulk mails please guide me
please help me......................
BY Ramds
MY Mail ID: [email protected]
Edited by: ramdasteja on Oct 3, 2008 4:13 AM

Hi .......... ALL
I am developing a News module in our project, for this have to write code to send everyday news for 20,000 mail Ids
I Developed a code that can send to one Id or multiple.
Weather this type of mail sending treated as spam mail or blocking the mail server i did not know, any of one can please help me.
If this type is not suitable then what is way to send bulk mails please guide me
please help me......................
BY Ramds
MY Mail ID: [email protected]
Edited by: ramdasteja on Oct 3, 2008 4:13 AM

Can't delete bulk mail message because can't see end of error message

My problem started trying to send bulk mail. I received the message "cannot send message using the server outgoing..... The server “outgoing.yahoo.verizon.net” did not recognize the following recipients:"
The problem is it is showing all the addresses I put in which doesn't end at the bottom of the screen. I guess at the end of the box, there must be some kind of choice I can click, but I just can't see it. I tried changing the screen resolution but still can't see the end of the message. I have to Force Quit to get out of Mail. How can I delete this message?

I am having exactly the same problem as I run a rugby club and am trying to sent to circa 500 people. However I get exactly the same problem you have described. The only way I have found of getting rid of the offending message is to quit\force quit mail and then relaunching. If it tries to send again I turn off AIrport and this puts the message into the outbox from where you can delete it.
Some ISP's in th UK limit how may recipients you can send a mail to to stop bulk mailers but the mac servers will sometimes let you send to in excess of 60.
I'll try and let you know if I find a way around this.

I am having trouble sending bulk emails (less than 100 at a time) on my gmail account using group names created from my address book. I use Mail on my I-Mac. When I try to send out a bulk email, the message shows up that my server can't send them, etc.

I am having trouble sending bulk emails from a Mail Group (less than 100 at a time) on my gmail account. They come back saying the server can't recognize the data and try again with selected server or try later or edit message, all of which I have attempted a number of times, including re-booting the computer. I am wondering if there is something wrong in my Address Book? I have check Apple Preferences, and Mail Preferences and all seems in order. I can send to any of the individual addresses, but not in a group.
Thanks for your help.

Install ClamXav and run a scan with that. It should pick up any trojans.
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In my Mail program (4.6), OS10.6.8, can I send bulk email bcc? If so is there a limit to the number of names/addresses that I can send?

In my Mail program (4.6), OS10.6.8, can I send bulk email bcc? If so is there a limit to the number of names/addresses that I can send?

To add the BCC field to the message window, create a new message, click the 'three lines' button near the to and from fields & select the 'BCC Address field' or choose the 'customise' option. This button may be a 'gear' on the older OS (I don't recall for 10.6.8 Mail).
The BCC field is more likely to be limited by the email server than Mail app. If you add hundreds of addresses (or use large groups with many addresses) the email server may assume you are sending spam. Sometimes it causes the server to drop the message or bounce them, different providers also have different rules, so you need to use bcc & ccc with care.
If you plan on doing mass mailing you would be better with a service that handles it correctly for you (i.e. sends multiple messages without using ccc or bcc).

SENDING BULK MAIL in JAVAMAIL

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