Website cant send messages

i use hostinger email hosting
i setup the records an verify the domain
when website send notification this error show:

Message could not be sent. Mailer Error: SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: Mail contain spam content 73A79402DF SMTP code: 550 Additional SMTP info: 5.7.1

See if you can use mail-tester.com to check your spam controls.

the email is send good and smtp of mail work good on mailer program but on website show this error :
Message could not be sent. Mailer Error: SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: Mail contain spam content 73A79402DF SMTP code: 550 Additional SMTP info: 5.7.1

no its a welcome user notifcation and password reset and message from website make same error and if I make and message else change content make same problem

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