Ray,
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Like Bruce mentioned, moderate any messages with an attachment. :)
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I've seen some of the gmx emails with soft nudity images attached as ads.? So, moderating ANY messages with attachments is a good thing really.
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To prevent emails with attachments coming in, set the resolution to something like 488x488, it's about the size of a 3x5 card and is very small in KB size.
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Another option, create a members upload FILE section that you can moderate.? Then move the FILE to another location for read, viewing, download access only.
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These are all suggestions, some or all could be applicable to how your group wants to function.
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Bret
BMaverick