Try it and you'd find out.
If it doesn't work, you may want to split up your mail--procmail should be good for that, but it's not easy to figure out at first.
Also, you could split up the files into, say, 100MB chunks (using dd), then moving the slack from the end of one file to the beginning of the next. It's probably tedious work, but if nothing else works...
hth --Jonas
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