Problem Definition

Currently if you forward a mail as an attachment, for example using Microsoft Outlook or Thunderbird, it shows up in a JIRA issue as a file with no extension containing a MIME formatted file containing xhtml with MS Office's extensions. Because there is no extension, clicking on the file does not open it in the appropriate way.

Suggested Solution

Adding a check to rename such a file to be called .eml or .msg would give the necessary hint required for a mail program to successfully open such an attachment.

Cause

Attaching an email in a client such as gmail will provide a filename for the attachment, for example:

Content-Type: message/rfc822; name="test.eml"
Content-Disposition: attachment; filename="test.eml"
Content-Transfer-Encoding: base64
...

Attaching an email in Outlook provides no name or filename for the attachment:

Content-type: message/rfc822
Content-disposition: attachment

As a result JIRA doesn't know what to name this file.

Workaround

• This has previously been suggested and implemented in JEMH as per https://thepluginpeople.atlassian.net/browse/JEMH-1376, so seems like it's possible to do this.
• Remove the "In-Reply-To:" header mail