Re: [exim] EMAIL RESTRICTIONS

David Saez Padros wrote:

> Hi !!
>
>
>>first, i want to limit the email access to only those addresses in our
>>domain. so i want to let anyone@??? send and receive with
>>anyone-else@???, but no-one@???.
>

*snip* (config details that control only the 'official' MTA)

Don't forget to also:

- firewall block traffic to/from all other outside ports to any device but your
MTA, and not just the 'obvious' ports 25, 465, 587, and 80.

- test your environment for WiFi, etc. coverage that you do not control

- block staff from access to telephone lines which can handle any of:

a) high-speed modems (easy - some PBX/key-hybrid won't support the b/w needed)

b) DTMF modems (harder, as it can prevent *dialing* once outside)

c) modems which fall-back to FSK (harder yet, notch filters, else no speech)