Solved

Sendmail

Posted on 1998-07-29
14
417 Views
Last Modified: 2013-12-26
How do I send mail from my application to a group of people. I guess that I could use sendmail. How do I program sendmail to achieve this task ? I don't have much idea about sendmail
0
Comment
Question by:nramesh30
14 Comments
 
LVL 5

Expert Comment

by:ecw
Comment Utility
Use a standard mail client (eg. mail) and popen (see example), though in production code add error checking.

FILE *mail = popen("/usr/bin/mail user1 user2 user3", "w");

if (mail) {
  fprintf(mail, "Subject: a report\n\n");
  fprintf(mail, "all ok.\n");
  pclose(mail);
}

0
 

Author Comment

by:nramesh30
Comment Utility
The user list to whom I have to send mail to , will be generated in my application. How do handle this situation ? I heard that sendmail would be very flexible to use for my case.
0
 

Expert Comment

by:bjornh
Comment Utility
Try this:

FILE *sendmail = popen("/usr/lib/sendmail -t");
if(sendmail)
{
  fprintf(sendmail, "To: %s, %s, %s\n", user[0], user[1], user[2]);
  fprintf(sendmail, "From: who@where.com\n");
  fprintf(sendmail, "Subject: test\n\n");
  fprintf(sendmail, "Body");
}
close(sendmail);
0
 

Author Comment

by:nramesh30
Comment Utility
thanks guys. that works perfectly fine. Is it possible to hide the user list to be shown up on the To field in the mail. Is it possible to program in such a way that the To field shows some thing like 'To undisclosed recipeints'

Thanks
0
 

Author Comment

by:nramesh30
Comment Utility
thanks guys. that works perfectly fine. Is it possible to hide the user list to be shown up on the To field in the mail. Is it possible to program in such a way that the To field shows some thing like 'To undisclosed recipeints'

Thanks
0
 

Author Comment

by:nramesh30
Comment Utility
thanks guys. that works perfectly fine. Is it possible to hide the user list to be shown up on the To field in the mail. Is it possible to program in such a way that the To field shows some thing like 'To undisclosed recipeints'

Thanks
0
 

Author Comment

by:nramesh30
Comment Utility
thanks guys. that works perfectly fine. Is it possible to hide the user list to be shown up on the To field in the mail. Is it possible to program in such a way that the To field shows some thing like 'To undisclosed recipeints'

Thanks
0
Free Trending Threat Insights Every Day

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

 
LVL 84

Expert Comment

by:ozo
Comment Utility
Bcc:
0
 

Expert Comment

by:ijduggan
Comment Utility
You can do this using perl to. The answer above in C is fine, but this includes all your options

#!/usr/bin/perl

$to = 'someone@somewhere.com';
@hidden_recipients('guy1@company.one','guy2@company.one');


open(SENDMAIL, "sendmail -t|");
print SENDMAIL, "To: $to", "\n";
print SENDMAIL, "Bcc: ", join(",",@hidden_recipients), "\n";
print SENDMAIL, "--------", "\n";
print SENDMAIL <<EOF
Hey,
This is an email I am sending you.
Later.
EOF

close(SENDMAIL);
exit;

OR YOU CAN ADD THE BCC PART TO THE C CODE FROM ABOVE

FILE *sendmail = popen("/usr/lib/sendmail -t");
if(sendmail)
{
   fprintf(sendmail, "To: %s, %s, %s\n", user[0], user[1], user[2]);
   fprintf(sendmail, "Bcc: %s, %s, %s\n", user[0], user[1], user[2]);
   fprintf(sendmail, "From: who@where.com\n");
   fprintf(sendmail, "Subject: test\n\n")
   fprintf(sendmail, "Body");
}
       close(sendmail);
0
 

Author Comment

by:nramesh30
Comment Utility
Thanks ijduggan,

Can I write a program which reads all the email addresses from a flat file and send emails to all of them simultaneously using sendmail ?
0
 

Accepted Solution

by:
ijduggan earned 40 total points
Comment Utility
Yes. You just need to send them to the STDIN of the program.

Using Perl:

To read off STDIN:

#!/usr/bin/perl

while(<STDIN>) {
    chop;
    $to = $_;

    open(SENDMAIL, "sendmail -t|");
    print SENDMAIL, "To: $to", "\n";
    print SENDMAIL, "--------", "\n";
    print SENDMAIL <<EOF
Hey,
This is an email I am sending you.
Later.
    EOF

    close(SENDMAIL);
}
exit;


This will read the files off of stdin. Put all of the addresses into a file, each on a seperate
line. Then call the program like this:

emailprogram < filewithaddress.txt

If you want to have the program read the file for you, open the file like this:

##!/usr/bin/perl

$namesfile = "filewithaddresses.txt";
open(NAMESFILE, ">filewithaddresses")
    or die "Couldn't open file $namesfile. $!";
while(<NAMESFILE>) {
    chop;
    $to = $_;

    open(SENDMAIL, "sendmail -t|");
    print SENDMAIL, "To: $to", "\n";
    print SENDMAIL, "--------", "\n";
    print SENDMAIL <<EOF
Hey,
This is an email I am sending you.
Later.
    EOF

    close(SENDMAIL);
}
exit;

0
 

Author Comment

by:nramesh30
Comment Utility
That's wonderful. But i'am not a Perl person . what does chop and $_ do ? how do I do this in C?
0
 

Expert Comment

by:ijduggan
Comment Utility
It would be much easier to answer your question if you would be more specific about your needs... C is pretty much the same. All you have to do is read the values off stdin or a from a file and use the C code above to send it. If you want to read the names from a file, look to the man pages if you don't know file io in C.

man fopen
man fdopen

STDIN would be the file descriptor you need.

0
 

Author Comment

by:nramesh30
Comment Utility
Instead of sending mail to the email addressess in the list ONE BY ONE, is it possible to send a bulk email simultaneously, at a time to al the recipients ?

some thing like
sendmail < listofrecipeints
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

Suggested Solutions

Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now