• email
• sendy

Sendy by default adds a List-Unsubscribe header that links the unsubscribe page of your Sendy installation.

If one wants to customize this header to use a custom field two files must be updated:

• includes/create/send-now.php line 568

$mail->AddCustomHeader('List-Unsubscribe: <'.APP_PATH.'/unsubscribe/'.short($email).'/'.short($subscriber_list).'/'.short($campaign_id).'>');

• scheduled.php line 612

$mail->AddCustomHeader('List-Unsubscribe: <'.$app_path.'/unsubscribe/'.short($email).'/'.short($subscriber_list).'/'.short($campaign_id).'>');

Sendy comes with two default fields:

• Name
• Email

Let’s pretend that you add 5 more fields:

• Gender
• Country
• Platform
• Paying
• UnsubscribeUrl

And you want to use UnsubscribeUrl for the List-Unsubscribe header. UnsubscribeUrl custom field index is 4. If you’re unsubscribe email is unsubscribe@domain.com, in both files includes/create/send-now.php#568 and scheduled.php#612 you have to replace the line with:

$custom_values_array = explode('%s%', $custom_values);
$mail->AddCustomHeader("List-Unsubscribe: <mailto:unsubscribe@domain.com?subject=".$email.">,<".$custom_values_array[4].">");

After that restart Apache server:

sudo service apache2 restart

References:

• Adding Custom Headers (List-Unsubscribe, List-Id, etc.).
• List Unsubscribe Header