Sending emails

Cascade sends emails via SMPT, the sender address is configured in the system from your domain – if there is any filtering involved you need to add the following SMTP server IP as a valid mail sender in your domain: 192.254.125.237. Please note it is also possible to set Cascade to use your own SMTP server / mail relay within Administration > System Properties.

Understanding suppression lists

Suppression lists prevent messages from sending to recipients who have opted out, marked emails as spam, or whose email addresses are deemed problematic. However, legitimate emails are sometimes included in these lists, causing users to miss important communications.

What is a suppression list and why do users end up on them?

A suppression list is a collection of email addresses flagged as problematic for various reasons, including:

  • Emails have bounced back as undeliverable. Addresses with incorrect or inactive accounts are often added to suppression lists to avoid repeated sending failures.

  • Users or your company have marked emails coming from IRIS as spam. If recipients mark our emails as spam, their addresses may be added to suppression lists to prevent further issues and protect our email domain / cloud reputation.

  • Our ESP (Email Service Provider) deemed these addresses problematic due to previous issues. Service providers may add addresses to suppression lists based on historical data, such as high bounce rates and low engagement.

Prevent legitimate emails from being suppressed: how we can help

  • Make sure all employees (who need to receive emails) have a valid and legitimate email address in the system.

  • Make sure your organisation has not blocked or marked IRIS emails as spam.

  • Work with your IT department and make sure your implementation of the SPF record is correct

Things to check if emails are not being received

  1. SPF records (you can check existing SPF record by using their domain that emails are sent from their cascade system, the bit after @, by going to mxtoolbox.com > super tool > SPF record lookup)

    • It should have ip4: 192.254.125.237 included in there.

    • The record should always start with v=spf1

    • URL addresses should usually be prefixed with include:

    • IP Addresses should usually be prefixed with ip4:

    • The ~all option should always be at the end of the record.

  2. We do not support DMARC and DKIM natively at this time. If they explicitly use the authentication/security methods, they will need to disable them or add exceptions if possible. Please see the DMARC guide for a workaround.

  3. Whitelist emails coming from 192.254.125.237.

  4. Impersonation/spoofing must be allowed.

  5. If they use a 3rd party filter (such as Mimecast) they must add exceptions for the email addresses that their Cascade sends from and the IP address 192.254.125.237.