Blocked port 25 in Mikrotik. How to open?

Question

Mail server

Good afternoon!
Since today, no mail has been sent from outlook. :
"Sending test email: Unable to connect to outgoing mail server (SMTP). If you receive this message again, contact your server administrator or ISP."
I decided to check the ports. Checked so "system telnet server_name 25" and "system telnet server_name 110"
110 - connects. But the 25th writes telnet: Unable to connect to remote host: Connection refused
Question: How to check where the blocking is? On the side of the provider or on our router? (I can't get through to the provider)
Flags: X - disabled, I - invalid, D - dynamic
0 ;;;
dst-port=1194 log=no log-prefix=""
1 ;;;
chain=input action=accept connection-state=established log=no
log-prefix=""
2 ;;; VPN_1
chain=input action=accept protocol=udp in-interface=Ether_7
port=1701,500,4500 log=no log-prefix=""
3 ;;; VPN_2
chain=input action=accept protocol=ipsec-esp in-interface=Ether_7 log=no
log-prefix=""
4 X ;;; Notification of Users
chain=input action=add-src-to-address-list protocol=tcp
address-list=Check address-list-timeout=none-dynamic dst-port=8080 log=no
log-prefix=""
5 ; ;;
chain=input action=accept protocol=icmp log=no log-prefix=""
6 ;;;
chain=forward action=accept protocol=icmp log=no log-prefix=""
7 X chain=forward action=reject reject-with=tcp-reset layer7-protocol=Main
protocol=tcp log=yes log-prefix="fw_ "
8 chain=input action=add-src-to-address-list protocol=tcp address-list=WakeU>
address-list-timeout=none-dynamic dst-port=1987 log=no log-prefix=""
9 X chain=input action=drop in-interface=Ether_7 log=no log-prefix=""
10 ;;;
chain=forward action=accept connection-state=established log=no
log-prefix=""
11 ;;;
chain=input action=accept connection-state=related log=no log-prefix=""
12 ;;;
chain=forward action=accept connection-state=related log=no log-prefix=""
13 ;;; !!!
chain=input action=accept src-address=192.168.1.0/24
in-interface=!Ether_7 log=no log-prefix=""
14 ;;;
chain=input action=drop connection-state=invalid log=no log-prefix=""
15 ;;;
chain=forward action=drop connection-state=invalid log=no log-prefix=""
16 ;;;
chain=forward action=accept in-interface=!
log=no log-prefix=""
17 X ;;; ( )
chain=forward action=drop log=no log-prefix=""
PS On the side of the mail hoster, everything was fine

Answer 1

telnet smtp.yandex.ru 25
telnet smtp.gmail.com 25
if both do not respond, call your ISP.

Answer 2

If you're thinking of blocking something on Mikrotik, disable all rules. Or write a rule to forward all traffic to the machine, purely to test your guesses. But why would Mikrotik spontaneously block something.