I had issues where amavisd was flagging legitimate email as spam, even though it was coming from a trusted network (logs showed that the email was flagged because it was missing some headers, used an IP instead of a domain for the sender, etc.).
It was email sent as notification from a RAID device to let us know if an error was detected - a somewhat important message!
I wanted to know how to whitelist an entire IP range/network. We have several devices on the network that may need to send email.
I finally found some working information. All I had to do was add two parts to the /etc/amavis/conf.d/50-user file:
# list of local IPs:
@mynetworks = qw( 127.0.0.0/8 192.168.1.0/24 );
# allow all mail from local IPs:
$policy_bank{'MYNETS'} = { # clients in @mynetworks
bypass_spam_checks_maps => [1], # don't spam-check internal mail
bypass_banned_checks_maps => [1], # don't banned-check internal mail
bypass_header_checks_maps => [1], # don't header-check internal mail
};
I ran service amavis restart, and I could send email again.