Senders to never classify as spam

The whitelist_from option is used to whitelist sender addresses which send mail that is often tagged (incorrectly) as spam.

Use of this setting is not recommended, since it blindly trusts the message, which is routinely and easily forged by spammers and phish senders.

The recommended solution is to instead use whitelist_auth or other authenticated whitelisting methods, or whitelist_from_rcvd.