Are you using any cloud or on-premises spam filtering appliancein front of your mail server?
You will need to whitelist by IP (or hostname) with your email/web filter.Click on your provider for more information:
AppRiver
Barracuda
Cisco Ironport
EdgeWave
Forcepoint (Websense)
Forcefront Protection for Exchange
Fortinet FortiGate
Lotus Domino
McAfee/MX Logic
Mimecast
Proofpoint
Securence
SonicWall
Sophos
SpamAssassin
Symantec.Cloud / Message Labs
Mailprotector
TrendMicro
VIPRE
Other
Can't whitelist in your email filter? Try Smart Hosting instead. Don't see your filter?Unfortunately, we don't have documentation on other filters at this time. Please contact support for assistance.
After you've whitelisted your email filter, you must whitelist your email server by header.
Which mail server do you use?
Please reference the below documentation for assistance:
Whitelist by Email Header in Exchange 2010 Whitelisting by Email Header in Exchange 2013, 2016, or Office 365
Whitelisting by Email Header in Exchange 2013, 2016, or Office 365
If you're using Office 365's Advanced Threat Protection (ATP) feature and you want to exempt KnowBe4's phish domains from being rewritten, visit here.
Whitelisting By Header In GSuite/Google Apps
At this time, we do not have documentation on other mail servers. Please contact support for assistance.
Please visit the below documentation for more information about whitelisting:
Setting up an IP Allow List in Exchange 2007 Setting up an IP Allow List in Exchange 2010 Whitelisting by IP Address in Exchange 2013, 2016, or Office 365
Whitelisting by IP Address in Exchange 2013, 2016, or Office 365
Whitelisting by IP Address in GSuite/Google Apps
