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(PHP Extension) Email BCC RecipientsSee more Email Object ExamplesExplains the meaning of BCC recipients, how it is different than CC recipients, and how Chilkat handles BCC.
<?php // The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number. // For example, if using Chilkat v9.5.0.48, then include as shown here: include("chilkat_9_5_0.php"); // In the context of email communication, the BCC (Blind Carbon Copy) field is used to send a copy of an email // to recipients without revealing their addresses to other recipients. When it comes to the MIME // header of an email, the BCC email addresses should not be included. // // The MIME header is a part of an email message that contains metadata and other information about the email, // such as the sender, recipient(s), subject, and other details. However, the BCC field is meant to be a confidential field, // and its purpose is to hide the recipients email addresses from each other. // // Including BCC email addresses in the MIME header would defeat the purpose of using BCC since it would expose // the hidden recipients addresses to the other recipients. This violates the intended privacy and confidentiality of the BCC feature. // // To maintain the confidentiality of BCC recipients, the BCC field should only be used in the envelope of // the email during the SMTP (Simple Mail Transfer Protocol) transaction. The SMTP server handles the actual // delivery of the email to the respective recipients while keeping the BCC information hidden from other recipients. // // It is important to ensure that BCC email addresses are not included in the MIME header of an email to // preserve the privacy and confidentiality of the recipients. // ----------------------------------------------------------------------------------------- // To discuss how Chilkat handles BCC, let's first create an email with some BCC recipients. $email = new CkEmail(); $email->AddTo('Joe','joe@example.com'); $email->AddTo('Mary','mary@example.com'); $email->AddCC('Steve','steve@example.com'); $email->AddBcc('Jerry','jerry@example.com'); $email->AddBcc('Tom','tom@example.com'); $email->put_Subject('test'); $email->put_Body('test'); // Let's examine the MIME print $email->getMime() . "\n"; print '----------------' . "\n"; // We have the following. // Notice the BCC addresses are not present. They are not included in the MIME header. // MIME-Version: 1.0 // Date: Mon, 10 Jul 2023 13:57:22 -0500 // Message-ID: <34606FFCB4A440B20E549A223F2F7BF0EB10EE2C@SLICE> // Content-Type: text/plain; charset=us-ascii; format=flowed // Content-Transfer-Encoding: 7bit // X-Priority: 3 (Normal) // To: Joe <joe@example.com>, Mary <mary@example.com> // Cc: Steve <steve@example.com> // Subject: test // // test // However the BCC address are still stored in the Chilkat email object. // For example, you can examine the BCC recipients in the email object like this: $numBcc = $email->get_NumBcc(); print 'Num BCC recipients = ' . $numBcc . "\n"; $i = 0; while ($i < $numBcc) { print $i . "\n"; print $email->getBcc($i) . "\n"; print $email->getBccName($i) . "\n"; print $email->getBccAddr($i) . "\n"; print '-----' . "\n"; $i = $i + 1; } // Output: // Num BCC recipients = 2 // 0 // Jerry <jerry@example.com> // Jerry // jerry@example.com // ----- // 1 // Tom <tom@example.com> // Tom // tom@example.com // ----- // Thus, when the email is sent, it will also be sent to the BCC recipients, // but the email received by each of the recipients (i.e. the raw MIME of the email) // should not and will not include the BCC email addresses. There should be no way // for the recipients to know that the email was sent to the BCC addresses -- because if // there is a way to know, then it is not truly BCC. ?> |
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