mail not sending 25 port also open

i facing issue on sending mail i using cent os 7 when i check email error log tail: cannot open ‘/var/log/maillog’ for reading: No such file or directory
How to i send email recive is fine

Check this guide to debug email sending problems → https://cyberpanel.net/docs/troubleshooting-cyberpanel/

thanks i got solution i am not set properly postfix mail server i not change host name so i send email some email provider they blacklist me than i change hostname of postfix mail server now work well thanks for help… this cyber panel nice working fast load website thanks for develop.