Sometimes anti-spam systems are stringent and will filter or block messages, even though they contain pertinent information for our users.
 
You can help us ensure that this doesn’t happen by working with your IT resources to whitelist our emails and ensure they make it to your inbox. Instructions are below for whitelisting all of our IP Addresses, whitelisting by email return-path, and whitelisting by “from address” – your IT Resources will likely know which option you need, but we can put them in touch with our team if they need additional help.

Allowing IP Addresses
Please ask your IT resource add these IP addresses to your corporate allow-list:

199.15.212.0/24
199.15.213.0/24
199.15.214.0/24
199.15.215.0/24
192.28.144.0/24
192.28.145.0/24
192.28.146.0/24
192.28.147.0/24
94.236.119.0/26
37.188.97.188/32
185.28.196.0/24
103.237.104.0/24
103.237.105.0/24
52.206.211.240

Allow-listing by Email Return-Path
In the case that your anti-spam system uses the email Return-Path field instead of the IP address for whitelisting, the best approach is to whitelist ‘*.mktomail.com’. This will ensure that all of the mailbox subdomains that are used by our email sending solution are included.
 
Allow-listing by “From Address”
If your anti-spam system whitelists based on the From address, be sure to include‘@socialsolutions.com’ and '@bonterratech.com' on your whitelist.