Dropbox Sign link expires after 7 days ?

Hi RS2020, how are you today?

First of all, let me apologize beforehand about the length of my message, I just want to make sure that I've covered everything. 

In regards to this Dropbox Sign link error that you get, it looks like your mail client is likely scanning the links in the Dropbox Sign emails as a security measure.

The links in the notification emails are essentially one-click logins, so when security systems access them to assess whether or not they are a threat, they actually use the one click available, which leads to the error you are seeing.

Since this error is being caused by a security system in place on your end, we are a bit limited as to what we can do to work around this. Do you have a different email address that you could use on your account? Keep in mind that this would need to be a different email address that does not have the same email security settings in place.

You may also be able to work around this by whitelisting the email address, and IP address that the Dropbox Sign documents are coming from. If you are able to make these changes, please see the following instructions:

Ask your email administrator to add hellosign.com and mail.hellosign.com to their approved domain list or to add our IPs of 143.55.224.101, 143.55.234.242, 161.38.193.231, 198.61.255.111 to their approved IP list.
 

Feel free to also add noreply@mail.hellosign.com to your contact list.

Please let me know if there is anything else I can help you with, I’d be happy to further assist you!