Error send e-mail

Hello, I have a error in send e-mail

Somebody can help me with this error ? I don’t know of type the error is it.

and how can I correct it ?error

That means your message was blocked by the server and classified as SPAM… If you are sending this from and to the same domain, maybe you IT can whitelist the address for you.

These type of error usually occur if you entered a wrong or non-existing email address or if the email address you are sending to is not accepting emails outside of their domain.
Kindly check that once pls
Cheers @_danielcrruz

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