Доброго времени суток!

В логах Exima очень много записей такого типа:

2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <loe4149sqs1me@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <alexxus@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <ayat@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <kendel@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <kalie@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <eliverto@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <kashlyn@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <dillinger@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <jawon@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <jaleen@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <mcarthur@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <mearl@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <avilene@malwin.com>: Unknown user
2023-09-23 02:12:28 H=host-177-185-208-106.globonet.net.br [177.185.208.106] F=<hq500op66i6v2m@zelinski.com.ua> rejected RCPT <labria@malwin.com>: Unknown user

...

Как можно ограничить, допустим, 5 а остальное все drop'ить? Или тут надо смотреть в сторону iptables?