Amavisd configuration file was not modified and it's a default install config.
Output of grep command:
15-av_scanners: # the quarantine directory, and the quarantine option can not be disabled.
20-debian_defaults:$quarantine_subdir_levels = 1; # enable quarantine dir hashing
20-debian_defaults:$final_virus_destiny = D_DISCARD; # (data not lost, see virus quarantine)
50-user:# listen on multiple TCP ports. 9998 is used for releasing quarantined mails.
50-user:$mailfrom_to_quarantine = ''; # null return path; uses original sender if undef
50-user:# Port used to release quarantined mails.
50-user:# Don't quarantine mails with bad header.
50-user:$bad_header_quarantine_method = undef;
50-user:#$spam_quarantine_to = 'spam-quarantine';
50-user:#$spam_quarantine_method = 'sql:';
50-user:#$virus_quarantine_to = 'virus-quarantine';
50-user:#$virus_quarantine_method = 'sql:';
50-user:#$banned_files_quarantine_method = 'sql:';
50-user:#$banned_quarantine_to = 'banned-quarantine';Thanks