first i must say i'm not a linux person. I've installed a MailRelay machine in my organization by reading "howto" posts all over and my system was working properly until yesterday.
my setup is
Amavis-new > ClamAV > SpamAssassin.

part of these are managed by Webmin GUI, and i'm monitoring the postfix/queue to verify that mail is flowing.

again, until yesterday - no problem at all.

yesterday, i ran the command /usr/bin/mailq
nothing was displayed as if the Q is empty.
since that moment, the Q in Webmin shows 0 messages.

however, tail shows the mail traffic as nothing happened, and all mail flow is excellent.

the folder /var/spool/postfix/active does have active mails in it, but what happened???

please advice