If you need to receive sensitive material from other people you can enable two factor authentication for these transfers.
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This means that people send you files using your own filemail page (e.g. yourcompany.filemail.com) like they normally do - but you (as the receiver) cannot download the files without a password. Filemail will generate a password for the transfer and send it to you via SMS - meaning that you have to have access to both your email/filemail account and your phone (SMS) in order to get the files.
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Go to https://www.filemail.com/companysettings#security in order to enable this feature for extra security.
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The cost for sending SMS'es are USD 0.3 - this will be billed on a monthly basis.