your email ended up in my spam folder, and I'm using google mail. So, it looks like something is wrong with your sender host.
Here's what I found in email headers:
X-I7-Spam-score: -2.6
X-I7-Spam-score_int: -25
X-I7-Spam-bar: --
X-I7-Spam-report: Spam detection software,
running on the system "caiman.init7.net", has
identified this incoming email as possible spam. The original message
has been attached to this so you can view it (if it isn't spam) or
label similar future email. If you have any questions, see
the administrator of that system for details.
Content preview: Does anyone @UPC happen to know what this means: host
mx.hispeed.ch
[213.46.255.2]: 552 5.2.0 rl4b1r00p3kCCMl01l4bgK automated process
detected
unsolicited content The email is being sent from a UPC connection,
via Hostpoint
(mail.hostpoint.ch) to a user @swissonline.ch. [...]
Content analysis details: (-2.6 points, 5.0 required)
pts rule name description
---- ----------------------
--------------------------------------------------
-0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/,
low trust [88.198.198.124 listed in list.dnswl.org]
-0.0 SPF_PASS SPF: sender matches SPF record
-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%
[score: 0.0000]