Al Iverson via mailop wrote:
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.
*nods* I was pretty much expecting that, just hoping for some points of reference that fit our triangular problem a little better than all the blob-shaped pegs.
The big one, I think, is how to scale out volumes. Anywhere that lists any kind of numbers lists it by recipient count or message count - "percentage of messages" (~~ SMTP connections) we can do, but we have no useful points of reference for any of the other metrics since we're not originating most of the mail ourselves. We host a little over 1200 domains including a bunch of ISP domains we've bought out over the years. Most customer domains are in the "1-10 users" range (personal domain or small business), and so are lost in the noise. We can't realistically direct mail from any given domain through a different set of outbound hosts than any other domain.
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.
As a self-homed ISP of fairly long standing, we don't have to worry about someone else pulling IPs out from under us. <g>
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.
Yeah, we have a to-do list to tune up our forwarding handling. This platform refresh is one supporting piece of that list.
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