In order to run your program effectively, you'll need to Whitelist the following INFIMA IP addresses:
54.240.43.212
34.232.212.184

And lastly, you'll add our Safe Sender address:
bounce@infimasec.com

And if you need additional guidance on the whitelisting process, take a look below:
Office 365 Whitelisting Instructions
GSuite (Google) Whitelisting Instructions

Still have questions? Shoot us an email at Support@infimasec.com.