iPhone picture mails tagged as Spam

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For a couple of days now I could follow a strange behavior in my mail servers. More and more spam mails were tagged when they were clearly normal ham mails. All these e-mails have something in common: They were sent by an iPhone and didn't contain a subject nor body text, only an attached picture. 

The problem is that such mails are now tagged by Razor (who knows why?):

RAZOR2_CF_RANGE_51_100=0.5, RAZOR2_CF_RANGE_E4_51_100=1.5,

Possible solutions show up. One of them is decreasing the Razor scoring, but as this is the first false-positive I personally see with Razor I don't want to do that. Instead a new spamassassin rule does the job:

header CK_IPHONE_PICTURE       ALL =~ /boundary\=Apple\-Mail.*/
describe CK_IPHONE_PICTURE     Mail sent by iPhone including picture
score CK_IPHONE_PICTURE        -5.0

Of all the affected mails I checked, they all had some header info in common. This rule checks the mails for the Apple-Mail header and scores it a bit lower.

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