Mail server is not working a error is showing that Some cloud vendors (such as Google, Amazon) close port 25 by default, and you need to contact the vendor to open port 25 before you can use the post office service normally
but my i tried to send mail to myself and my server port 25 is open also telnet domain.tld 25
returning Connected to domain.tld. Escape character is '^]'
but still the error is showing and mail is not returning back to me.