Massive inbound connections to smtp port 25

RouterOS General
1

I had a trojan in one of my computers and it started sending out spam.Therefore our ip got blacklised. Problem is fixed now but I am still getting massive inbound connections to port 25. I have set up 2 new firewall rules regarding outgoing connections on port 25

add action=add-src-to-address-list address-list=spammer address-list-timeout=\
1d chain=forward comment="Detect and add-list SMTP virus or spammers" \
connection-limit=30,24 disabled=no dst-port=25 limit=50,5 protocol=tcp

add action=drop chain=forward comment="BLOCK SPAMMERS OR INFECTED USERS" \
disabled=no dst-port=25 protocol=tcp src-address-list=spammer

And one regarding inbound connection on port 25 wihich tarpits all inbound connections to port 25.

Is it possible to make my ip unconnectable for inbound connections on port 25?
Any kind of help is really appreciated.

2

This is what you can do.

3

Are the port 25 inbound connections showing up on your localnet from the internet? Or just at the WAN port of the router? One is a forward rule, the other is a input rule. The port 25 inbound requests should not be showing up on your localnet unless you routed it there.