You would need to whitelist our email addresses. This problem seems to occur the most with Hotmail, so this guide will give instructions on how to whitelist us. The same methods should apply for other email providers.
1) Login to your email and go to settings.
2) View full settings
3) Select Junk email section, and scroll down to Safe senders section
4) Enter the following into safe senders and safe mailing lists:
You should now be able to receive email communications from COSS.io