Perl

Add a Custom Header Field to an Email

Demonstrates the Chilkat Email.AddHeaderField method, which adds a standard or custom header field. If the field already exists, this method replaces it (use AddHeaderField2 to allow duplicates). Header fields whose names begin with CKX- are not transmitted when the email is sent, but are preserved across XML save/load, making them handy for persistent metadata. This example adds a custom X- header and reads it back.

Background: Beyond the well-known headers (From, Subject, etc.), MIME lets you add arbitrary fields. By convention custom, non-standard fields are prefixed with X-, so mail systems know not to expect them in the standards. Applications use these to carry tracking IDs, campaign tags, or routing hints. Chilkat's CKX- convention goes a step further — those fields live with the object but are stripped before the message is actually sent.

Chilkat Perl Downloads

Download Chilkat for Perl

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# Demonstrates the AddHeaderField method, which adds a standard or custom header field.
# If the header field already exists, this method REPLACES it.  (To allow duplicates,
# use AddHeaderField2 instead.)  Header fields whose names begin with "CKX-" are not
# transmitted when the email is sent, but are preserved when saved to/loaded from XML.

my $email = Chilkat2::Email->new;
$email->Subject('Custom header example');
$email->From('alice@example.com');

# Add a custom header field.
$email->AddHeaderField('X-Custom-Header', 'custom value');

print 'X-Custom-Header = ', $email->GetHeaderField('X-Custom-Header'), "\n";