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iCIMS - Mailservers

US, Canadian, and EU Mail Hosting Environments

iCIMS systems allows for users to send emails to any recipient with a profile within the system. The email will be sent from an iCIMS server using one of the IP addresses listed below. If your company only allows emails from specific senders on its firewall, it may be necessary to allowlist the following ranges below, to ensure successful delivery.  
 
iCIMS follows best practice recommendations regarding email delivery using Optimistic TLS, SPF, DKIM and DMARC.

  • All iCIMS email sending domains are origin controlled with SPF.
  • All iCIMS email display domains are authenticated with 2048 bit DKIM keys.
  • All iCIMS email domains are further authenticated with DMARC reject policies.

 

IPv4 Network IPv4 IP Range
162.247.160.0/21 162.247.160.1 - 162.247.167.254


Sending Domains

The first thing your recipients see when they open your email is your address in the From: field, also known as the Friendly From or the Visible Sender. The Sending Domain is the domain portion of this email address.

The sending domains that iCIMS uses are as follows:


Bounce Domains

The first thing a receiving mail server will see when they receive an email from an iCIMS system is the bounce email address, also known as the Return-Path or the Envelope Sender. The Bounce Domain is the domain portion of this email address. This email address is typically hidden and only visible in the full email source headers.
 
The bounce domain that iCIMS uses are as follows:

Notes:

  • The IP addresses listed above are dedicated to iCIMS customer email traffic only. 

  • iCIMS does not require all customers to add the entire range above to your allowlist. However, adding to your allowlist may be necessary if iCIMS is sending as your email domain.
    • If iCIMS is sending email as your domain and you wish to allow this behavior, please reference the Configuring Email Authentication article.
    • If iCIMS is sending emails as your domain and you do not wish this to continue, bi-directional email must be re-enabled in your iCIMS system. Submit a case to iCIMS Technical Support to make sure these default settings are enabled.
  • iCIMS cannot provide a single IP address for customer email traffic.
  • iCIMS prefers TLS for SMTP traffic where the receiving mail server supports TLS but is unable to require TLS for any specific customer.

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