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File not downloaded, There are potential security risks

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hello,when i download my attached files in mailbox(mail.xmvds.com), it can be everytime warnning me ,but i trust this url ,it is my company's office mailbox ,how can it unblock it ,?

hello,when i download my attached files in mailbox(mail.xmvds.com), it can be everytime warnning me ,but i trust this url ,it is my company's office mailbox ,how can it unblock it ,?

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If you click the item on the Downloads list, does Firefox give more information about its decision? For example, did the attachment come from an insecure site, or an uncommon site, etc.