Firewalling SMTP

["Denis Croombs" <denis@xxxxxxxxxxx>]

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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