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Your question makes the following poor assumptions:

1. "AI" exists

2. They are using "AI" to begin with

This is just marketing. Nearly any time you see the phrase "AI" used, it's pure marketing.

AI can refer to classifiers, perhaps neural networks, or some probabilistic algorithms. I find it hard to believe that marketing department would just label something as AI without any underlying algorithm existing[1]. So, for what kind of work does mail sending service needs classifiers/neural networks?

[1] Ignoring outright fraudulent press releases of course. This doesn't seem like a fraudulent company.

Abuse detection, in order to maintain high sender reputation, perhaps?

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