How to set up mail on VestaCP?

Question

Mail server

Good afternoon.
There is a dedicated ip from the provider. + computer on which VestaCP is installed. There is also a domain in the dns records of which the dns records are copied from VestaCP.
After creating a mail in VestaCP for my domain, I enter this mail. And I can receive letters to it, but I can’t send letters from it .. When I try to send a letter from it, I immediately receive a system letter with an error.
How to set up mail forwarding?
command response..
Command: nslookup my dedicated ip
Output:
Server: 192.168.0.1
Address: 192.168.0.1#53
my dedicated ip.in-addr.arpa name = my dedicated ip.users.breezein.net.