It's generally a bad idea (i.e. not supported) to stick messages larger than 250k through spamassassin. The spamc client refuses to check messages larger than this size, and the example procmailrc in /usr/share/doc/spamassassin/examples/procmailrc.example mentions this.
The only reason I haven't closed this bug is because I can't figure out where this is documented. :-) -- Duncan Findlay
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