we've been operating ISPMan+openldap+postfix+Cyrus+horde, but then moved our services to Plesk. Having looked back, I'd still go again with Plesk. It saves a lot of time, and normally a sysadmin's working time is more expensive than the software license.
It has its limitations and unconveniences, but in general it's a great product.
A strong advice is to put a greylisting server in front of it on a separate machine (might be a virtual machine).
Besides, I studied together in the same University with Sw-Soft's core team ;-)
regards, stan
--- Nico -telmich- Schottelius nico-swinog@schottelius.org wrote:
Hello!
Just wanted to ask what setup you use or recommend for large scale sites (~10k users, some hundreds of imap(s), smtp, webmail connections, about 5-10 mails incoming and outgoing per second):