Not sending emails to Custom domain

We can able to send and receive emails to gmail, we cannot able to send emails to custom domains like [email protected] etc… Recently we get this issue.

records are seem pointed to the zoho

The mail is not sending from bitzburg.in domain, I’m trying to send the mail to [email protected],

And from bitzburg.in, I can able to send email to gmail like [email protected], But when I trying to send custom domain like [email protected] Its not sending, But Its working before properly.