On Mon, 12 Mar 2018, Mark Elkins via Exim-users wrote:

The machine is for Mail Submission - so it can have a common "inbound"
interface for my clients - and just needs a specific outbound IP address.

I have a fair number of IP addresses. I'd like to have a pool of
interfaces - each with their own IP address. My users details are all
stored in a database table so I could also add an IP address there, the
one that this particular client should use when my EXIM sends out their
e-mail. If that IP address becomes blacklisted - it would then affect a
much smaller percentage of my users. I could then have one IP address
per group of customers!

In exim.conf - I've used:

# Interfaces That Exim Listens on
local_interfaces = <; 127.0.0.1 ;    ::1 ; \
                      192.111.222.1 ;  2001:1234:abcd:5678::1 ; \
                      192.111.222.2 ;  2001:1234:abcd:5678::2 ; \
                      192.111.222.3 ;  2001:1234:abcd:5678::3

(fake numbers)

I assume one could assign a particular IP address for outbound?

I don't know the current position, but in 2011 Spamhaus was blacklisting IPv6 addresses in /64 blocks
https://www.spamhaus.org/organization/statement/012/spamhaus-ipv6-blocklists-strategy-statement
so I don't know whether your pool of addresses will protect your clients
as well as you hope.

--
Andrew C. Aitchison                                     Cambridge, UK
                        [email protected]
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