C function to interact with /usr/sbin/sendmail

Posted on 2003-02-23
Medium Priority
Last Modified: 2006-11-17
I'm trying to do a function to send emails using Linux's /usr/sbin/sendmail. My code is:

void send_email(const char *email_address)
     FILE *email;
     email = popen("/usr/sbin/sendmail -t", "w");
     fprintf(email, "To: %s\n", email_address);
     fprintf(email, "From: %s\n", "user@domain.com\0");
     fprintf(email, "Subject: %s\n", "Automatic email\0");
     fprintf(email, "This is the email body.\n\n");
     fprintf(email, "\n");

It does not work.
Question by:wguiot
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Accepted Solution

skian earned 120 total points
ID: 8008784

This piece of code works here (rh7.2).
Do you use valid "from" and "to" addresses
wrt your sendmail config ?



Author Comment

ID: 8017078
I'm using valid FROM and TO addresses.

What about "wrt your sendmail config"? I don't understand your comment. Is there something I need to do in the sendmail config?

Expert Comment

ID: 8023928

Well, your current sendmail config may not allow
mail relay, ie it could reject a mail if the TO
or FROM address is not known.
For example, to have this piece of code running
here, I had to replace the from address by mylogin@localhost

What is the return value from pclose ?

Have you tried sending the same message from
the shell command line ?


Author Comment

ID: 8037937
The function works, the call to it was unreachable.

My bad!.

Thanks, anyway. I'm accepting the answer because it might serve as an example for pipes for someone else.

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