You can reference this Docusign eSignature security document:

https://www.docusign.com/trust/security/esignature

Docusign email IP addresses

If customers need to allowlist Docusign’s email IP addresses, the following apply:

North America-based and demo accounts (current and continuing):

• IP range: 209.112.104.1 - 209.112.107.254
  CIDR notation: 209.112.104.1/22

• IP range: 64.207.216.1 - 64.207.219.254
  CIDR notation: 64.207.216.1/22

• IP range: 162.248.184.1 - 162.248.187.254
  CIDR notation: 162.248.184.1/22

• IP address: 54.240.32.183
  CIDR notation: 54.240.32.183/32

European Union-based accounts (current and continuing):

• IP range: 185.81.100.1 - 185.81.103.254
  CIDR notation: 185.81.100.1/22

• IP range: 192.103.120.1 - 192.103.123.254
  CIDR notation: 192.103.120.1/22

Additional third-party providers email IP addresses

Customers that use static email IP range filters on their incoming email servers will need to add new IP addresses in the allowlist to prevent rejection of legitimate Docusign emails.

North America-based and demo accounts

IP range 54.240.115.126 - 54.240.115.137 and IPs:

• 161.38.201.204

• 161.38.201.205

• 161.38.201.202

• 161.38.201.203

European Union-based accounts

IP range 54.240.54.89 - 54.240.54.92 and IPs:

• 204.220.160.187

• 204.220.160.199

Support for Sender Policy Framework (SPF) record checking

To flag and quarantine malicious spam on mail servers, enable both Sender Policy Framework (SPF) lookup functionality and Domain-based Message Authentication, Reporting & Conformance (DMARC). The combination of these technologies helps protect against malware spam attacks. Learn more about SPF at http://www.open-spf.org/ and DMARC at http://www.dmarc.org/.

As most of our customers contact me about fishing email which is not from Docusign.net domain. You also can reference this document how to recognize fish email like Docusign:

https://www.docusign.com/trust/security/incident-reporting

FreeLink/甫连信息
DocuSign Partner | Partner Profile
The only DocuSign Partner globally certified as both a Certified eSignature Administrator and eSignature Technical Consultant
DocuSign 2024 APAC Reseller Growth Partner of the Year
Ranked #1 in the OG All Star category in DocuSign Community Wrapped 2024
DocuSign Community Leaderboard Top 5 contributor
Expertise in DocuSign integrations with on-premises systems for leading enterprises across various industries
 Connect with me on LinkedIn: https://www.linkedin.com/in/gehengfeng/

Thank you but we prefer not to whitelist. We will continue to let our email filtering examine the email. According to documentation, the link is valid for 48 hours. If a valid email is quarantined, then the recipient can request a review and release. 

Yes, if the recipient told that they not received the signing email, they can contact the sender. and the sender can create case with Docusign Support team. the Docusign support team can check the backend smtp log whether got 250 cdoe from the recipient’s mail server. if got 250, so the email is delivered in the recipient’s mail server and find the mail server admin check.

FreeLink/甫连信息
DocuSign Partner | Partner Profile
The only DocuSign Partner globally certified as both a Certified eSignature Administrator and eSignature Technical Consultant
DocuSign 2024 APAC Reseller Growth Partner of the Year
Ranked #1 in the OG All Star category in DocuSign Community Wrapped 2024
DocuSign Community Leaderboard Top 5 contributor
Expertise in DocuSign integrations with on-premises systems for leading enterprises across various industries
 Connect with me on LinkedIn: https://www.linkedin.com/in/gehengfeng/

Hello ​@MPLikesEmail,
 

I hope you are doing well. 

I want to confirm if you were able to solve your issue by utilizing the suggested solution or if the information provided was useful.

Let me know and I will gladly help you address the situation as soon as possible.

Best regards,
Ma. Cassandra | Docusign Community Moderator

"Select as Best" below if you find the answer a valid solution to your issue!

Thank you for following up but we decided to leave it as is. We prefer not to whitelist. Our customer will reach out if they don’t get an email. 

Hello ​@MPLikesEmail,

We appreciate your update. Feel free to let us know anytime if you need any more help.

Best regards,

Melanie | Docusign Community Moderator

"Select as Best" below if you find the answer a valid solution to your issue.