Brad Ellis wrote: > > Yup, use an access list filtering IPs on port 25 (only allow > yours through)
Yes, but, other SMTP servers for legitimate reasons are also going to be opening TCP sessions to port 25 because they have e-mail to send to your users. It's not as easy as it sounds. I guess it depends on the ISP's network architecture too. We have a challenge where I work in that our users are on cable modems that connect to the cable provider (which isn't technically us). Their e-mail requests come into our network on the same interface that all Internet traffic comes in on. Priscilla > > thanks, > -Brad Ellis > CCIE#5796 (R&S / Security) > [EMAIL PROTECTED] > Cisco home labs: www.optsys.net > ""GEORGE"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Hi all I have a question ,I configured my e-mail server to > only accept > > local e-mail, and deny other relay , however im still > vulnerable to > > spam. My question is how do the ips block other e-mail going > to their > > smtp > > Do they do it by access-list? Allowing only the local network > with port > > 25? > > Or just the e-mail server? > > If cisco routers have to be involved does anyone have some > links. Im > > behind a pix and would like to allow only my network to use > smtp. > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=48989&t=48971 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
