#72 Improve display of message/rfc822 attachments

[Anonymous]

Originally created by: gosko

In hypermail v2.4.0, when a message has an attachment with type message/rfc822 the attachment is displayed as:

attached mail follows:

---

[message body]

This omits some of the most important info about the message: who sent it, where and when.

It would be good to display at least a few of the headers in these cases: From:, To:, Subject:, Cc:, Message-Id: (maybe based on the show_headers config option)

A few examples showing the issue in W3C's public archives: one, two, three

Supporting recursion for nested message/rfc822 attachments may be challenging (and seems less important), but even some basic display of the headers in the first level message/rfc822 attachments would be a big improvement.