(C) Send Email to Distribution List

Sends the same email to a list of 1000 email addresses in 50 sends where each email has 20 recipients.

Note: Chilkat is not intended nor designed for mass emailing. A solution such as this might be used for a corporate emailing to employees, or an emailing to newsletter subscribers.

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#include <C_CkMailMan.h>
#include <C_CkEmail.h>
#include <C_CkBinData.h>
#include <C_CkStringTable.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    BOOL success;
    HCkEmail email;
    HCkBinData bdMime;
    HCkStringTable distList;
    HCkStringBuilder sbRecipients;
    int i;
    int szDistList;
    int j;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    mailman = CkMailMan_Create();

    CkMailMan_putSmtpHost(mailman,"smtp.mymailserver.com");
    CkMailMan_putSmtpPort(mailman,465);
    CkMailMan_putSmtpSsl(mailman,TRUE);
    CkMailMan_putSmtpUsername(mailman,"myUsername");
    CkMailMan_putSmtpPassword(mailman,"myPassword");

    // Create a new email object
    email = CkEmail_Create();
    CkEmail_putSubject(email,"This is a test");
    CkEmail_putBody(email,"This is a test");
    CkEmail_putFrom(email,"Senders Name <sender@example.com>");
    CkEmail_AddTo(email,"Subscribers","subscribers@example.com");

    bdMime = CkBinData_Create();
    CkMailMan_RenderToMimeBd(mailman,email,bdMime);

    // Load a file containing one email address per line.
    distList = CkStringTable_Create();
    success = CkStringTable_AppendFromFile(distList,1000,"utf-8","qa_data/distList.txt");
    if (success == FALSE) {
        printf("%s\n",CkStringTable_lastErrorText(distList));
        CkMailMan_Dispose(mailman);
        CkEmail_Dispose(email);
        CkBinData_Dispose(bdMime);
        CkStringTable_Dispose(distList);
        return;
    }

    sbRecipients = CkStringBuilder_Create();

    i = 0;
    szDistList = CkStringTable_getCount(distList);
    j = 0;
    while (i < szDistList) {

        // Build a list of comma-separated recipients.
        if (j > 0) {
            CkStringBuilder_Append(sbRecipients,",");
        }

        CkStringBuilder_Append(sbRecipients,CkStringTable_stringAt(distList,i));

        i = i + 1;
        j = j + 1;

        // If we have 20 recipients, or we have the final recipient in the final chunk, then send.
        if ((j == 20) || (i == szDistList)) {
            success = CkMailMan_SendMimeBd(mailman,"sender@example.com",CkStringBuilder_getAsString(sbRecipients),bdMime);
            if (success != TRUE) {
                printf("%s\n",CkMailMan_lastErrorText(mailman));
                CkMailMan_Dispose(mailman);
                CkEmail_Dispose(email);
                CkBinData_Dispose(bdMime);
                CkStringTable_Dispose(distList);
                CkStringBuilder_Dispose(sbRecipients);
                return;
            }

            j = 0;
            CkStringBuilder_Clear(sbRecipients);
        }

    }

    success = CkMailMan_CloseSmtpConnection(mailman);
    if (success != TRUE) {
        printf("Connection to SMTP server not closed cleanly.\n");
    }

    printf("Email sent to distirbution list.\n");


    CkMailMan_Dispose(mailman);
    CkEmail_Dispose(email);
    CkBinData_Dispose(bdMime);
    CkStringTable_Dispose(distList);
    CkStringBuilder_Dispose(sbRecipients);

    }