The Conga Team is migrating Conga Sign services to new infrastructure on July 8, 2020. As a result of this change, IP addresses used or referenced to whitelist Conga Sign emails are no longer supported.
Conga has taken the necessary steps to ensure that all emails originating from the Conga Sign service are valid. Additionally, Conga has protections in place to prevent spam and spoofing attempts, which makes whitelisting Conga Sign emails mostly unnecessary.
Instead of whitelisting specific Conga IP addresses, it is highly recommended to use DKIM and SPF validation in your inbound email server software, if it is not already enabled. Also consider adding the domain "conga-sign.com" to an allow list in your email server configuration, instead of using a dedicated IP address.