debian, amavis, virus inside archive One my client asked informed me, that amavis skips some files types. mail server configuration is really simple: Postfix as SMTP server and amavis working as context filter. Also amavis runs spamassasin and clamd antivirus. Amavis gets files from attachment and unpack it. lha file is not detected. short investigation First I deceided to run amavis in debug mode and verify how virus passed postix+amavis. root@newserver:/var/lib/amavis# /etc/init.d/amavis stop [ ok ] Stopping amavis (via systemctl): amavis.service. root@newserver:/var/lib/amavis# /etc/init.d/amavis debug Trying to run amavisd-new in debug mode. Debug mode inform about loaded plugins: ' Nov 13 22:07:23.335 newserver. /usr/sbin/amavisd-new[40334]: Found decoder for .cpio at /bin/pax Nov 13 22:07:23.336 newserver. /usr/sbin/amavisd-new[40334]: Found decoder for .tar at /bin/pax Nov 13 22:07:23.336 newserver. /usr/sbin/amavisd-new[40334]