This is a mix of ISA and IIS, not sure which is more relevent so..
I want to make our ISA server our SMTP relay for inbound and outbound email
using the IIS SMTP Service.
AIUI I can do it one of two ways after disabling socket pooling:
Have a single IIS virtual SMTP server listen on the internal IP of ISA, and
use the secure mail wizard to publish an external IP on ISA to this
internal virtual server. Inbound mail is routed to our internal servers
using remote domains.
I can then set our internal servers to use this SMTP virtual server as
their outbound relay as it's on a private internal IP, and create the
appropriate outbound packet filter on ISA, this is pretty much what we do
at present, and it works fine.
Alternatively, I can use packet filters to allow inbound and outbound SMTP
on ISAs external IP address, and have one SMTP virtual server listen on
that external address and use remote domains to forward inbound mail to our
internal Exchange servers, and then create a second virtual server that
listens on a private internal IP to receive and relay outbound mail.
AIUI either method would work, but I'm unsure of the real world benefit of
doding one over the other.
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