Knowledgebase: Inbound Mail Flow
Adding MailChimp IPs to your Safe Sender List (Converting larger ranges into /24)
Posted by Mikkel Christensen, Last modified by David Szoke on 05 January 2018 08:59 PM

Adding larger CIDR ranges to Proofpoint Essentials

Currently, Proofpoint Essentials only supports up to /24 CIDR ranges. 
However, some 3rd party services such as MailChimp use larger ranges than we support. 

In these cases you will need to break up the bigger CIDR ranges into /24 ranges. 
This can be done with a variety of tools that you can find freely available online. 

Once converted into /24 ranges, you can copy paste multiple CIDR ranges into the Safe Sender list at once

MailChimp example below

In the below table you will see the outcome of converting /20, /18 & /16 CIDR ranges into /24 ranges.

MailChimp currently uses following CIDR ranges:

*These IPs are correct as of Oct 2017. Essentials Support will not be monitoring any updates to MailChimp IPs*
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