Have mailman and postfix running on a compaq dl380 - dual P3 at 800Mhz and 1.5 Gb ram HW RAID 1 array. From what I've been told the line it's on is a T1 shared between two subnets - one local to the office and one at remote data center - the system is on the local subnet. Mailman / Postfix set up with understanding of one "announcement only " list with approx 400 members, one blast to members per day - been working great for months, then client uploads/subscribes 50K new members/email address and sends a nice juicy posting at noon. Network is swamped, connectivity is slow for users in the office, yadda yadda - Some advanced notice would have been nice... but going forward I'd like to make sure the system doesn't consume all available network bandwidth. Been researching Postfix and some mailman settings to tweak, and possibly adding a DNS cache to the machine and then thought of using the OS to rate limit the bandwidth available to port 25 - anyone have any hints/tips on whether or not this is a good idea? Would there be time out issues or something with Postfix if the "pipe" is too slow etc? thanks -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.mn-linux.org/pipermail/tclug-list/attachments/20060410/47bf1d8a/attachment.htm