Urgent! - My email is being flooded and my all domain users getting spem mails from my emails address name.

Urgent! - My email is being flooded and my all domain users getting spem mails from my emails address name.

Hi  Zoho Team,

Since last few days we are receiving some spam mails using our domain that is bdsserv.com. I believe some thing is happening wrong. Can you guys please rectify this & get back to us with proper solution.

Due to this there are we feel unsecured.

Please also let us why this is happening if someone is hacking our server or not.