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I see this often in business emails, I guess it is not very important in terms
of meaning but I couldn't find any post on stackexchange about it.

What does とのことです add to a sentence? Here is the latest example I've read:

> 碑文谷警察署の本町二丁目交番とのことです
CC BY-SA 3.0
2014-06-30T02:25:57.667
17605
2018-03-23T10:25:54.260
664
question
politeness keigo business-japanese
Usage and meaning of とのことです
> とのことです

is a hearsay and a bit formal way.

For example, your boss said Mike is working at 碑文谷警察署の本町二丁目交番.

Then, your business partner asked you where Mike is working at?

So you answered

> 碑文谷警察署の本町二丁目交番とのことです。

If you like to express it in common way, you can say

> Mikeは碑文谷警察署の本町二丁目交番で働いています。
CC BY-SA 3.0
2014-06-30T05:50:45.947
17607
2018-03-23T10:25:54.260
2018-03-23T10:25:54.260
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answer