Summary

When commenting on an issue via email and attaching an eml file in the email itself, the eml file gets attached to the issue but has no extension.

This causes inconvenience when trying to view the attachment in it's original format (email which is to be opened via email client)

Steps to Reproduce

1. Send an email to a mail handler inbox which has an eml file as an attachment

Expected Results

1. Issue gets created
2. eml file attached to the issue with proper extension

Actual Results

1. Issue gets created
2. eml file attached but does not have any extension

Notes

Not able to reproduce in JIRA 7.1.7 in Firefox

Workaround

1. Download and save the file without an extension
2. Rename the file with the proper extension
3. Open it with preferred email client