How to fix Dropbox Sign Outlook link errors

Updated Sep 22, 2026

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The information in this article applies to all Dropbox Sign users.

If you click an invitation or reset password link in your Outlook email and see an error that the link isn’t valid, your Outlook security settings may be preventing the link from working.

Outlook has security features that can sometimes quarantine emails from our noreply email addresses (noreply@mail.hellofax.com and noreply@mail.hellosign.com).

To make sure our emails to you aren’t quarantined, ask your Outlook admin to add Dropbox Fax and Dropbox Sign to your organization’s allowlist in Outlook.

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