If you firewall smtp to only accept connections from your 3 internal hosts, you won't get any inbound email from outside since external hosts can't reach the smtp server. Outbound mail will work ok from that server or the 3 firewall allowed internal hosts.
POP is for retrieving email from the server.
If your goal is to have the CentOS box serve as a mail gateway for inbound & outbound email, you'd use /etc/mail/access to control how sendmail handles connections from hosts. In that file you'd give your 3 internal hosts permission to relay mail through that server.
On 1/14/07, Denis Croombs <denis@xxxxxxxxxxx> wrote:
I have a Centos server and I want to only accept mail for the local users
from 3 mail servers, but I still want the users to be able to send emails
through this server, If I firewall the SMTP port to my 3 mail servers is
there any way users will be able to still send via the main POP server ?
(currently using Sendmails SMTP-Auth)
Thanks
Denis
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