qmail - receiving emails (thousands of spams)

Suddenly, somebody started to send thousands of emails to a domain name we control. I see messages for:

aaab@domain.com
aaac@domain.com
aaad@domain.com
.......
etc.
All have the same subject and all originate from the same IP.

I use PLESK and on Plesk there are 2 options:
Bounce with phrase: or
Catch to address

I tried both of them but my queue is still growing.

Then disabled mail for that particular account. Still no luck.

What should I do to block (not queue) all messages sent to that domain name (not bounce or catch all)? Any solution for this?

The last thing I have done is disabled MX from DNS. My remote queue is still growing and I already deleted many emails with qmHandle:

[root@server02 root]# perl /var/qmail/bin/qmHandle -s
Messages in local queue: 0
Messages in remote queue: 5236
[root@server02 root]# perl /var/qmail/bin/qmHandle -s
Messages in local queue: 0
Messages in remote queue: 5254
[root@server02 root]# perl /var/qmail/bin/qmHandle -s
Messages in local queue: 0
Messages in remote queue: 5284
[root@server02 root]# perl /var/qmail/bin/qmHandle -s
Messages in local queue: 0
Messages in remote queue: 5344

Any suggestion is welcome.

 

 

 

 

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