Is there any Drupal alternative/solution to mail list serve?

Kristopher says:
I have a client who is having trouble uploading files larger than 2MB. I have increased the php_memory value in the htaccess file and he is still having problems. Yet when I upload files to teh server directly via FTP (as high as 60MB), no problems.

a) what else should i be troubleshooting so he can upload using drupal successfully

b) He is concerned about members having trouble downloading and wants to know if there is any way we can simulate high traffic and multiple downloads at once to ensure once the site is open to members there will not be any problems

Hint:

http://www.drupal.org/

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