Send SMTP Mail Message: 4.3.2 Service not available error

Hello,

Recently we chnaged IP of our vm means we are basically using new VM for our automation.
previously with old vm mail activities are working fine .I am using port 25.
now we are getting error in smtp activity like below.

Please help me on same.

Hi @Mathkar_kunal,

Has the IP address of your working machine been added to the SMTP server? You can ask this to the system administrators. I think the problem is caused by this.

Regards,
MY