I'm gearing up to replace parts of our ISP mail infrastructure, and I'm
looking at deploying new hosts on new IPs for both regular outbound mail
and forwarded mail. I wasn't all that close to the action with the last
round, which was done by just replacing systems in place on the same IPs
and copying queued mail to the new systems.
I've been doing some searching, which out to the tenth page of search
results has almost exclusively turned up references around marketing
mail sent by a monolithic organization, not general ISP traffic. The
few links that weren't exclusively targeted to marketing mail were
pretty heavily slanted that way.
I've recently finished a tour of the last ~decade in the list archives,
but I didn't see many relevant threads. Those also mostly devolved into
the same more or less irrelevant advice around "click rates" and
"engagement", which mean nothing when what we send (or relay) is at most
someone else's marketing mail that we're passing on to a final
destination by request of our customer.
Does anyone have any suggestions beyond the obvious "start with low
volume, ramp up over $timeperiod"? What kind of $timeperiod? What
kinds of volumes? I don't have detailed, fine-grained controls over
what goes where, but I can set the load balancer to weight a new node
much less than the live nodes and increment it over time.
Daily volume varies quite a bit; for regular outbound, ~~15k
messages/day on weekends, anywhere from 35k to just over 100k on
weekdays, although most days are on the lower end of that range.
Forwarded mail - ie, received by either an ISP-domain mailbox or a
hosted domain mailbox/alias and forwarded elsewhere (usually GMail or
Outlook.com) runs about 2/3 of that.
-kgd
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