The promise can sit in the terms of service, the data processing agreement or a product’s privacy settings. Consumer AI apps often train on conversations unless you opt out; business and API terms usually rule it out by default.
Why it matters
For an AI email tool there are two layers to check: the tool itself, and the AI providers it uses, its sub-processors. A clause from the tool is only as strong as the terms it holds its providers to. Look for the exact wording, “will not use customer content to train”, rather than a general reference to privacy.
Keeping what a tool learns about your business within your own account, to write your replies, is a different thing from training a shared model, and a good vendor explains which is which.
An example
A business asks a drafting tool whether its AI providers can train on the emails. The tool points to the providers’ business terms, which forbid it, and to its own DPA.
In ReplyPen: The AI providers ReplyPen works with operate under business terms that forbid training on your content. Details on where your data goes.