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This is a big reason for sure. As you can see in this post, those IP addresses can be hit or miss depending on the provider. At Postmark, we don't really believe in dedicated IPs for all customers. We think that our customer base should not include any bad actors, and instead manually approve every customer to ensure our entire CIDR ranges are clean. The benefit is not just clean IPs, but clean IPs that have an incredible transactional-only reputation with the ISPs. This is how we are able to delivery so fast to the inbox. We only really believe in dedicated IPs for higher volume senders, especially since reputation is moving toward the domain more and more. I wrote about this six years ago, and it is even more true today (https://postmarkapp.com/blog/the-false-promises-of-dedicated...).

At the same time, if you are willing to install and manage Postal on your own servers, it's not that hard to maintain your own IP with a great reputation. You just need a good hosting provider (probably not AWS), you need to set up your infrastructure like DKIM, SPF, DMARC, rDNS, and Return Paths, and most importantly you need to maintain good engagement (low bounces, high opens). At a glance, Postal looks like a nice option if you want to do it on your own for cheap. You just might lack the stability, support, maintenance, and performance that goes behind an ESP.

> manually approve every customer to ensure our entire CIDR ranges are clean

This is probably a key element of good performance. To keep my mail admin duties part time I simply whois the IP of evil senders and drop the resulting entire CIDR block into the our local blacklist.

Why wouldn't spammers just start adopting Postal on their servers, too?

Judging from the amount of it the sending email portion is not what spammers struggle with. It's the "maintain your own IP with a great reputation" part. How would Postal help?

That's apparently a process that takes time, but in the long run it could easily pay off. Over the years I've dealt with "Verio" selling my ip address to spammers. Before that they had entire ranges of IP blocked that I got caught up in.

A couple years ago I did the work to use "Mandrill" in an app and they got merged with "MailChimp" who changed how my app could use their service and I had to redo those routines again.

Right now I'm using Mailgun and they're awesome.

Well from the install directions they recommend 8GB of memory for the server. A simpler SMTP server like Postfix or Exim can do with much fewer resources, and a spam operation doesn't care about abiding by protocol for redelivery attempts, they just fire and forget and mostly opt for direct SMTP delivery.

Because their IP address reputation would plummet instantly.

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