what is the security risk with message/partial?
Sending 7 emails each with a picture attachment doesn't seem to me to be an issue per se, so I presume that their mail client might have split it up. Any clients known to do this? Workarounds?
If the email is JPEG image, as in your case, there's no harm. However, if the email contains virus, and it is sent as message/partial, it can't be detected by virus scanners. Theoreticall, each mail could contain only one byte of the actuall virus code. There's no way for virus scanners to scan such an email. Most commercial anti-virus tools will block message/partial by default also. None that I know of will attempt to reassemble the email.
There are handfull of mail clients that support the feature. One of them is MS Outlook Express. In preferences you can set that messages exceeding certain size should be split up. In that case, Outlook Express will generate message/partial.
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