[Dovecot] Can't got mail by OUTLOOK for a half million mails account

[Thomas Harold]

On 9/1/2011 10:34 PM, Dong Ding wrote:
>
> I used postfix always_bcc to backup mail. And  up to now the backup account
> has half million mails in cur/, when I first time tried to receive the mail
> by outlook, it failed , no responds.
>
> Does any one has some good idea to deal with this problem?
>

If it's IMAP, you may have to try Thunderbird or some other IMAP client. 
  But most are going to horribly die past 100k messages in a single 
folder (and some will die much sooner).

There's also the brute force method of moving 90% of the messages to 
some other temporary folder on the file system, grabbing the 50k that 
are left.  Then moving messages back into the new/ folder in batches of 
50k or so.

I'll echo Gregory's comment that you really need to setup some sort of 
Sieve rules to split out messages to sub-folders on-the-fly going forward.