Mail addresses with more @ signs

Lasantha Marian x72m35 at
Wed Jun 12 12:15:17 IST 2013

I have noticed that MailScanner ignores messages with envelop address 
having more than one "@" sign. Notably those messages are appended with 
an IP address. An example like (sender at xyz.uv@ returns 
"X-ABC-MailScanner-SpamCheck: spam(no watermark or sender address)".
Any thoughts as to what could cause this (letting this spam go as ham). 
Looking at the message content, they are positively spam.
Best regards.

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