[Trees-research] failure notice

[MAILER-DAEMON at dequeue2.pacific.net.sg]

Hi. This is the qmail-send program at dequeue2.pacific.net.sg.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<sengheng.cheong at gmail.com>:
<sengheng.cheong at gmail.com> 64.233.163.114 failed after I sent the message.
Remote host said: 552 5.7.0 Illegal Attachment c1si2173937nzd

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