Maildir was designed to work over NFS but I don't think that anyone cared much 
about performance. Mail servers tend to either be small enough that performance 
is never a problem or big enough that NFS just isn't viable.

Dovecot and other IMAP servers should work together. Dovecot is designed to 
regenerate indexes when necessary. I don't think performance would suffer much 
given that a common use case is having a program other than Dovecot doing 
delivery.

On January 12, 2015 10:35:19 PM GMT+13:00, Andrew McN <[email protected]> 
wrote:
>
>
>On 06/01/15 18:02, Russell Coker wrote:
>
>> If you want decent performance with IMAP then just don't use NFS. 
>The write 
>> pattern of mail stores is a poor match for the way NFS works and the
>large 
>> number of files doesn't work too well for read caching.
>
>Wasn't playing nice with NFS the main motivation for Maildir's
>development?  I think the issue was mostly with locking rather than
>performance, but still...
>
>
>>> The issue isn't so much the dovecot can be configured to do x with y
>>> resources it has to do with the fact that things are generally in
>>> production and have web mail, AV, mailman, SMTP, procmail, SA, etc
>all
>>> working together in real time on a single node. Fixing/messing with
>one
>>> function of the server can impact the others.
>> 
>> If you have a running mail server it's not too difficult to change
>the process 
>> that serves POP/IMAP without changing the rest.
>> 
>> You can even have 2 programs serving POP/IMAP on different ports or
>IP 
>> addresses until you are happy that the new one does everything
>correctly.
>
>Hmm.  You wouldn't expect other mail daemons to know about Dovecot's
>indexing systems.  It might work correctly, but would at least have a
>performance impact.
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