How can I disable the ***UNCHECKED*** tag that Amavis applies to a message when an email is not able to be scanned?

Amavis will prepend to Subject (for local recipients only) if mail could not be decoded or checked entirely, e.g. due to password-protected archives.

To disable this on Centos/RHEL edit the file /etc/amavisd/amavisd.conf or on Debian/Ubuntu edit the file /etc/amavis/conf.d/99-warden and add the line (before the last line 1;):

$undecipherable_subject_tag = undef;

After making the changes restart Amavis:

// Centos/RHEL/CloudLinux/AlmaLinux
systemctl restart amavisd

// Debian/Ubuntu
systemctl restart amavis
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