We currently have a mail setup handling mail for about 50 000 users. We have a home-brewed solution which is unfortunately cannot handle imap at the moment. We have 3-4 P166 machines to handle the POPping, with the users spread over these machines. The mail spool is mounted from a netapp nfs machine. There are 2 or 3 dns-round-robined PIIs running sendmail.
The pop client and procmail replacement were coded in-house for speed, simplicity and remote authentication.
However, we are now working on a new solution, which would comprise the following:
3 HP NetServer LC3 machines running modified versions of cucipop and procmail, and sendmail. (This is for NFS safe file locking). cucipop is modified to authenticate off a radius server (via PAM). Procmail is modified to allow all mail boxes to be owned by one user. Sendmail user a virtuser table to accept and deliver mail. There are no extra users in the passwd file. These machines will sit behind a layer 4 switch (or failing that, use DNSRR)
We also have an exchange server (LC3) handling mail for about 400 users. It falls over all the time.
Slashdot Mirror
We currently have a mail setup handling mail for about 50 000 users. We have a home-brewed solution which is unfortunately cannot handle imap at the moment. We have 3-4 P166 machines to handle the POPping, with the users spread over these machines. The mail spool is mounted from a netapp nfs machine. There are 2 or 3 dns-round-robined PIIs running sendmail.
The pop client and procmail replacement were coded in-house for speed, simplicity and remote authentication.
However, we are now working on a new solution, which would comprise the following:
3 HP NetServer LC3 machines running modified versions of cucipop and procmail, and sendmail. (This is for NFS safe file locking). cucipop is modified to authenticate off a radius server (via PAM). Procmail is modified to allow all mail boxes to be owned by one user. Sendmail user a virtuser table to accept and deliver mail. There are no extra users in the passwd file. These machines will sit behind a layer 4 switch (or failing that, use DNSRR)
We also have an exchange server (LC3) handling mail for about 400 users. It falls over all the time.