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Out of office HTML

Posted: Thu May 16, 2019 8:37 am
by gabrieles
Hi all,
is there a way to use html in Out-Of-Office messages?
I've done some search but there's no much. I found that Out-Of-Office are considered MDN, and therefore must be compliant to RFC 2298.
RFC 2298 is very strict about the message format. Among the restriction there are:
- Specific format, only (machine readable) text, no attachments of sort
- Specific mime content-type, like Content-Type: multipart/report; report-type=delivery-status;
- Blank "From:" header

The last condition would render the Out-Of-Office unusable, so every mailserver (not only zimbra) ignores it.
Regarding the content type, zimbra ignores the rfc and uses simple Content-Type: text/plain; charset=utf-8
So why does enforce on the text format?

Even forcing html code in the zimbraPrefOutOfOfficeReply, the code is rendered as text/plain and not formatted.
Is there a workaround?