You'll want to be aware of "IP Warming," the process of limiting volume at first to build up a good sending reputation over a few weeks. https://www.spamresource.com/2020/09/what-is-ip-warming.html Though my guidance is oriented to email marketing senders, it effectively applies to you as well. I went through this as well a few months ago, when my ISP changed upstreams and had to renumber the network where my MTA lived. I actually switched to Amazon SES for a while (which works well but isn't free). I eventually moved back to my own MTA, building up a new sending reputation from scratch. It was fairly simple for me, because I'm low volume - a weekly newsletter to 1400 people, personal email, and a few mailing lists. Basically a few thousand emails a day.
You're going to find email forwarding to be a huge pain in the rear in 2024. You'll want to segregate it and likely limit it. I only do email forwarding where I rewrite the headers. Which is not something that everybody likes. If you can, you'll want to spam filter what you forward or you're going to tank your deliverability by forwarding spam. You may also want to use a seperate sending IP for forwards, because they're likely to get blocked a lot. I'd be happy to answer any questions, if you like. Cheers, Al Iverson On Mon, Jan 6, 2025 at 3:54 PM Kris Deugau via mailop <mailop@mailop.org> wrote: > > 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 > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop -- Al Iverson // 312-725-0130 // Chicago http://www.spamresource.com // Deliverability http://www.aliverson.com // All about me https://xnnd.com/calendar // Book my calendar _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
