Hi, Jerry Stuckle <[email protected]> (Di 11 Feb 2014 19:43:20 CET): > Hi, all, > > I'm having a problem with hackers trying to break into my email > server with various userid's and passwords, I suspect on port 25 > (but haven't proven it). I do eventually block the IP, but not > until after several unsuccessful attempts. > > What I would like to do is prevent logging in via Port 25 (I use a > different port for signing into the server), hopefully stopping > these antics in their track. > > Can someone suggest how I can do this?
You may enhance your autenticator sections:
begin auth
…
server_advertise_condition = ${if !eq{25}{$received_port}}
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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SCHLITTERMANN.de ---------------------------- internet & unix support -
Heiko Schlittermann, Dipl.-Ing. (TU) - {fon,fax}: +49.351.802998{1,3} -
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