HI @Chris_Kamps, sorry to hear about this trouble. It looks like your team would need to whitelist our IP’s to prevent our emails from being marked as spam. Here are the IP’s that we recommend whitelisting:
54.240.65.106
54.240.65.107
54.240.67.145
54.240.67.146
54.240.67.147
54.240.67.148
54.240.67.149
54.240.67.150
54.240.67.151
54.240.67.152
54.240.67.153
54.240.67.154
54.240.67.155
If the issue persists, please reach out to our Support team and they will have more tools to assist you