We have had a problem with outside Systems using our Server for a router and I was wondering if anyone knew of a good way of setting up the SMTP/POP Servers so that only :SMTP → Email in to our Users
POP → Email only out From our Users
Thanks
Subject: Blocking Spam Routing
You mean:
SMTP - in to your users from remote sites AND in to your users/through to non-local users from your POP/SMTP users
POP - out to your POP/SMTP users
That is, you are using POP/SMTP clients for some of your users, yes?
- You need to close the server to relay:
http://chris-linfoot.net/d6plinks/CWLT-5W4K4A
- Then permit relay for authenticated users and have your POP/SMTP users authenticate when sending. Ensure that:
a) a strong password policy is in place for the Internet passwords of all users in your PAB and
b) no accounts exist in your PAB with generic names like system, backup, web etc or if they must exist, that they also have strong passwords.
Here’s why:
http://chris-linfoot.net/BlogByCategory?OpenView&RestrictToCategory=SMTPAUTH
Subject: RE: Blocking Spam Routing
Close but not Quite
All our users use the internal notes Transfer system but we need to send mail out to external users Eg Hotmail.com
None of your users use SMTP/POP to route mail, that is only used for external access to other mail systems
What I want to do is allow this but block anyone who is not an internal user from sending mail through our server.
At the same time I want to allow external client (eg Hotmail.com) to send emails to our users internally.
If the method that you have described will work for this then let me know.
OR
If there is a better method of setting the system up then also please let me know
Subject: RE: Blocking Spam Routing
In that case it is very easy.
If all your users use the Notes client and NRPC, the ONLY SMTP traffic you will want at your server is outsiders trying to deliver email to your users. So just close the server to relay as in my first link on my last reply and that is all.