Running 4.2.1 on CentOS 4.3, stock Apache, php and mysql (with all updates installed). Tested sending a PDF attachment to an email. The email was sent and received, but the attachment isn't being recognized by my MUA, Evolution. the mime typs reported by Evolution is:

application/x-unknown attachment

That nicely breaks Evolution's ability to open the attachment directly from the email by calling the associated PDF viewer. I can still save the attachment and then open it, but it's not what I'm looking for.

I sincerely hope this isn't by design to work around some crappy bug in Outlook.

Here are the relevant bits from the email:

X-Priority: 3
X-Mailer: PHPMailer [version 1.73]
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="b1_c6578e4b545302b45fd89e7b24035fe7"
X-Spam-Checker-Version: SpamAssassin 3.0.6 (2005-12-07) on
webster.systemsaligned.com
X-Spam-Level:
X-Spam-Status: No, score=-5.1 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,
TO_ADDRESS_EQ_REAL autolearn=disabled version=3.0.6


--b1_c6578e4b545302b45fd89e7b24035fe7
Content-Type: text/plain; charset = "iso-8859-1"
Content-Transfer-Encoding: 8bit


--
Kanwar Ranbir Sandhu
Linux and OSS Professional

Systems Aligned Inc.
10 George St. North
Brampton, ON L6X 1R2
Canada

phone: +1.905.791.8015 ext. 6000
web: www.systemsaligned.com

--b1_c6578e4b545302b45fd89e7b24035fe7
Content-Type: application/x-unknown; name="at-invoice-205.pdf"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="at-invoice-205.pdf"

[attachment encoding snipped]

--b1_c6578e4b545302b45fd89e7b24035fe7--