On 08/12/2010 00:29, Timo Sirainen wrote:

On Tue, 2010-12-07 at 13:22 +0100, Giovanni Mancuso wrote:

...

I read in documentation that there is "mail_max_userip_connections", but in this way i limit the login that come from same ip. If the same user tries to connect from different ip, he succeeds.

Can i do it? Not directly. If you don't care about mail_max_userip_connections, you can force it to ignore the user's IP with some hack:

a) modify source code Can i wirite a plugin to do this? Or i must modify source.

OT: Is there a valid documentation that explain how can i write a plugin?

b) send all traffic via a dummy localhost proxy, which changes Dovecot to see the IP as 127.0.0.1

Why do you want this anyway? Are you trying to prevent one user accidentally from using too many connections, or to prevent intentional DoS? I think the former is pretty unlikely, and the latter can be worked around by DDoSing instead.

In my system, there are some users that connect with the same username, and i would prevent this.

Thanks