Symptoms

When using the mail archive feature of Confluence, some mail sent with attachments get imported without their attachments.

Cause

The Mail library we use relies on a content-disposition header to determine whether there is an attachment attached to the message. According to this specification this field is unnecessary.

Workaround

There is a patch for versions of Confluence (3.0.x and 3.1.x family) that uses the Mail 1.6 libraries. See Mail with Attachments in Confluence 3.0.x and 3.1.x Are Lost.

Resolution

Upgrade to Confluence 3.2 or later.