>If port 25 filtering is implemented, you can either change the port you are
>listening on
But will the roamers know how to set up their mail clients to send to
another port??
eg, a quick look a my main personality in Eudora 5 does show not me
how to send outbound to a port, only to a hostname or ip.
>I believe you are an IMGate user, so you could also do SMTP AUTH on your
>postfix box (postfix shouldn't have a problem running on more than one
>port). You need to install CYRUS SASL and compile support for that library
>into postfix. Then you can setup PAM (pluggable authentication modules)
>with a RADIUS module that can auth against your RADIUS server.
yes, all that's doable technically, but how would he get his RADIUS
accounts and Imail accounts sync'd up, same logins and
passwords? Imail doesn't AUTH against RADIUS. And while postfix can
AUTH against LDAP, Imail's LDAP server doesn't provide secure AUTH, (yet).
The only what I can see is to have Imail and postfix both auth
against an external SQL database. Imail talks to the tables through
ODBC and postfix could talk to the same tables through an OpenLDAP
server based on the SQL server. I don't know whether postfix can
AUTH though something like UNIXODBC.
I really think the only practical way, for most of us, is to go along
with the trend of IPS's blocking port 25. Access to Imail's port 25
from Internet could then be blocked at the border router, really
protecting Imail, and forcing all inbound SMTP to IMGate. ie,
roamers would not relay through the IMail ISP but only through their
access provider's SMTP relay.
Len
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