I’m using the plugin contact form 7 that generates an email after submitting a form. The form sends an email to 4 people. When I use the default smtp built into wordpress the email is sent and all 4 people and are visible on the To field (Each user that received the email can see that it was sent to 4 people). When I use the SparkPost plugin (using http api) the email gets sent to the 4 people but only the recipient email address is visible (only one person is on the “To” field). My understanding is that Sparkpost API includes this functionality by sending “Header_to” field when the email is posted for sending. However I don’t know if this feature doesn’t exists in this plugin or there is a bug in the code which is preventing multiple email addresses from appearing on the “To” field.
