Difficulties with posting to nscumber

Is there a maximum message size for nscumber?

I posted a rather long message on Saturday afternoon but 4 hours later it had still not been posted so I resent it.  Now, two days later, neither message has appeared and neither is in the nscumber archives.  (Fortunately, I cc'ed it to the person who wanted the information and have already received a reply... so I know my ISP is not the problem.)

I am "receiving" messages from nscumber, so I have not been cut off.  Any ideas?