I'm currently using MailMan with Postfix and I noticed some 'missing' features (or maybe my fault :P).

Those are: Disable sorting of recipients when injecting the messages. This will help using less memory when using MTAs like Postfix or QMail.

I don't think this has been addressed as an option yet.

     Disable or hardlimit (globally) the number
     of concurrent SMTP connections that MailMan
     will open to inject the messages. This will
     be helpfull to let a user maintain it's our
     list without hogging the system down. (You
     know... Stupid users who set this to like
     100!).

Are these implemented? Sorry if it's already. :P

This also isn't a feature, but for a quick hack you can just take it out of the CGI interface. People could still get around it by issuing a POST with that variable set, but they'd have to know what they're doing AND want to be malicious. The disadvantage is that this affects every list on your system. Anyhow, comment out the section about num_spawns in $prefix/Mailman/MailList.py, around line 431 or so.

#('num_spawns', mm_cfg.Number, 3, 0, #'Number of outgoing connections to open at once ' #'(expert users only).',

  #"This determines the maximum number of batches into which"
  #" a mass posting will be divided."),

I've also done this with host_name, max_message_size, and web_page_url, but plan on making it a per list config option that can only be set by the system admin.

Chris