The mailing list for listmasters using Sympa

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I have set up a Sympa list serv server (6.0.3) and everything is working fine
for the most part. One issue that I am running into is sending files over ~580
KB in size (just a normal .txt file) are not going through. I am getting the
following error.

Impossible to distribute your message for list 'list-name' because of an
internal server error.

I have verified that my "Maximum message size (max_size)" setting in Sympa is
get to 5 MB so that shouldn't be the problem. If I try sending the same .txt
file after taking out a few lines, and the file size is ~530 KB, then it works
just fine. Nothing is really jumping out at me in the logs either. Any help
would be greatly appreciated.