Form not sending an email

Hi Everyone,
I have a problem when i use contact form7. when i have text domain name in Message Body. example my domain is example.com then i have this text in Body Message on Mail and Mail (2). i found that i don’t get email. it show successful message when i submit. if i remove that text (example.com) then i get an email.

My hosting is on godaddy, can someone advise me please.

Thanks.