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Disable spam virus scanning for outgoing mails

To disable spam/virus scanning for outgoing mails, you can add bypass settings in Amavisd config file: /etc/amavisd/amavisd.conf (RHEL/CentOS) or /etc/amavis/conf.d/50-user (Debian/Ubuntu) or /usr/local/etc/amavisd.conf (FreeBSD).

bypass_spam_checks_maps
bypass_virus_checks_maps
bypass_header_checks_maps
bypass_banned_checks_maps

These settings can be added in setting block $policy_bank{'ORIGINATING'}:

$policy_bank{'ORIGINATING'} = {
    [...OMIT OTHER SETTINGS HERE...]

    # don't perform spam/virus/header check.
    bypass_spam_checks_maps => [1],
    bypass_virus_checks_maps => [1],
    bypass_header_checks_maps => [1],

    # allow sending any file names and types
    bypass_banned_checks_maps => [1],
}

Restarting Amavisd service is required after changing settings.