Dom> It all depends on whether you mean "shared mail queue" or "shared Dom> maildrops"... Sharing the mail queue is a big nono, really. Dom> None of the existing MTA's support doing this, and it will cause Dom> you slow mail delivery and general havoc.

Shared maildrops and home directories is what I'm looking for. I'm planning to leave the mail queues on the individual machines, though a combined view of everything would be nice. (Actually storing each machine's queue (separately) on the filer might be nice for reliability and management reasons. I'm not sure about performance.)

Dom> Shared maildrops are a different issue. If you use something Dom> like qmail[1], OTOH, there are simply no locking issues Dom> whatsoever (and easy POP3 support, but no IMAP).

I'll have another look at qmail, but we're pretty firmly entrenched in the sendmail camp at the moment, for a variety of reasons.

Dom> Don't forget to set up a directory hashing scheme, though as Dom> 100,000 files in a directory will also cause you performance Dom> problems. :-)

I'll probably do this anyway while switching over. We don't have enough files now to be much of an issue on a WAFL file system, but we might as well put in the scalability now. -- Alan