Why do some brokers send a .p7s file as attachment along with the daily digital contract note delivery?

Why do some brokers send a .p7s file as attachment along with the daily digital contract note delivery?

What is the importance of such a .p7s file?

A P7S file is an email message that includes a digital signature. It can be used for sending secure emails that can only be viewed by the intended recipient. P7S files verify that the email is from who it claims to be from and that the email has not been modified in transit.

https://fileinfo.com/extension/p7s

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