Allow sending custom headers #118
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When adding headers to the
$headersarray in thewp_mailfilter, only a few recognized headers ('Content-Type', 'Cc', 'Bcc', 'Reply-To', 'From', 'X-PM-Track-Opens', 'X-PM-TrackLinks', 'X-PM-Tag') are picked up by the plugin, and the rest is just silently dropped. This PR adds headers that are not recognised now (and used by the plugin internally) to a custom headers array that is sent to the Postmark API, and thus end up in the message sent by Postmark.