[Dovecot] Disable imap proxy access

[Scott Silva]

on 10/3/2007 3:25 PM Bazy spake the following:
> Ed W wrote:
>>> How to disable pop3 and imap access during the data migration process
>>> (duration 5 minutes to 10 minutes). Can i send a custom error message to
>>> our users ?
>>>   
>>
>> I don't recall the exact details, but I think both options are possible
>> if you check the dovecot wiki.  There is a good study regarding the
>> proxy stuff, and some notes on sending custom errors back (along with a
>> note that it's not supported on many clients)
>>
>> If you use SQL then you could simply change the query temporarily
>>
>> Also when I do my migration I change the permissions on the home folders
>> first (root:root say) - this way if I muck something up they don't get
>> logged into the old mailbox.  Then I reset the permissions back on the
>> new server and update the proxy settings.  This also gives a random
>> error back to the client in the meantime if they try and log in.
>>
>> I should think that the above could even be scripted and run per mailbox
>> for a very subtle downtime period... I use rsync once while the mailbox
>> is online, then change perms so that the user can't login, then do a
>> final rsync to get any changes across.  I didn't check whether there is
>> a problem with an existing connection still accessing the data after the
>> perms were changed though...
>>
>> Good luck
>>
>> Ed W
> 
> I'm not an perl expert, but... you could create a script that listens on
> port 143, and one for 110, that acts as a server. So right after ".login
> <username> <password>" the perl script will print an error, telling the
> client that the server is down for maintenance or something like that.
> 
> Like when you get the 550 error in smtp and it says "die spammer" :).
> 
> I think you can use IO::Socket::Telnet.
> Take a look over these scripts:
> http://www-user.tu-chemnitz.de/~uro/perlgoodies/server/
> 
> It's just an idea...
> 
Or just stop the dovecot running on the proxy and the connections will just die.

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