Suggestion: mark addresses not ending with certain domains


An interesting feature would be to be able to define “recognized” domains (for example those of the company for a pro account) for which email addresses would be displayed normally when writing a message (a:, cc: … fields). The other addresses would then be displayed differently (for example in red).

We find this on some mail clients such as Mail on macOS for example. It’s very useful to make sure we don’t unintentionally send an email to the outside from a work account.

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Businesses are not K-9 Mail’s target audience. I’m not opposed to adding such a feature. But it’ll never be a priority for me.
If your company is willing to pay for the development of such a feature feel free to reach out to me at