Ayuda (Help me!) Error 554 5.2.3 Mail Policy violation Mail Size exceeds limit

Ayuda (Help me!) Error 554 5.2.3 Mail Policy violation Mail Size exceeds limit

Hi,

I have this error when sending messages...

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Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the relay  smtp.zoho.com  [165.254.168.48].

The error that the other server returned was:
554 5.2.3 Mail Policy violation : Mail Size exceeds limit
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I should do to fix the error?