Am 20.03.2013 13:39, schrieb dormitionsk...@hotmail.com:
> I'd like to use Dovecot as our IMAP server when our users are within our LAN, 
> but I'd also like to give them the ability to access their emails via POP3 
> when they are outside the LAN.  I know most POP3 clients will give their 
> users the option of not deleting the messages from the server after they are 
> downloaded, but is there any way to restrict them from being able to do so at 
> the server level?
> 
> In other words, I want to disallow the server from accepting the DELE command 
> from POP3 clients.
> 
> Is that possible?
> 
> We have some accounts that multiple users need simultaneous access to.  I 
> don't want a user to decide to set up a POP3 account on his own on his iPad 
> or something, and inadvertently blow the Inbox away for everybody else.
> 
> We have a satellite connection, so our upload speeds are real slow.  I think 
> POP3 would give a lot better user experience than IMAP when they are outside 
> the LAN.
> 
> Any help or advice will be greatly appreciated.
> 
> Peter, hieromonk
> 
> ----
> Dormition Skete
>  Monastery Website:  http://www.DormitionSkete.org
>  Convent Website:  http://www.HolyApostlesConvent.org
> ---- 
> 
> 
> 

dont think this is possible, but you may redirect mails to subfolder (
filter for big mails ) with i.e. sieve and exclude the subfolder from
pop3 sight
i blogged some example with virtual plugin, sorry german and not exactly
what you asked for, its for auto sort spam mail , but perhaps it gives
you an idea how solve your problem

for the whole situation , why not simple allow only imap , and perhaps
use folder acl etc , downloading only subjects first  or some special
folders etc to save bandwith should be possible with most mobile clients

http://sys4.de/de/blog/2013/02/11/dovecot-virtual-setup-mit-globaler-sieve-spamfilter-regel-fur-pop3-nutzer/


Best Regards
MfG Robert Schetterer

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