Currently within eZ Publish there is no way to specify extra mail headers for outgoing emails from within the templates. This support exists for specifying a subject, cc/bcc recipients and content type among others.

This patch provides support within eZ Publish to define an array within templates using

{set-block scope=root variable=extra_headers}

to define extra email headers that should be present when mailing. Due to a limitation in set-block that prevents providing named keys, the header name and value are delimited with a semi-colon.

The attached patch provides this support across all instances of eZMail within the trunk at this point.