Dropbox Sign email invitation links no longer valid

If you click an invitation link in your email and see an error that the link isn’t valid, your email account security settings may be preventing the link from working. Try updating the  security settings in your email account. 

To update the security settings in your email account:

• Ask your email admin to add app.sign.dropbox.com and mail.hellosign.com to their approved domain list.
• Ask your email admin to add the following IP addresses to their approved IP list:
  • 198.61.255.111
  • 69.72.47.246
  • 143.55.224.101
  • 143.55.234.242
  • 161.38.193.231
• Add noreply@mail.hellosign.com to your contact list.

After you update your email account security settings, click the invitation link in your email. If you still see an error that the link isn’t valid, try using another email account with different security settings.