SMTP error 552 typically occurs when there are issues with the attachments on your email that you are trying to send. For example, it would indicate that the attachment is too large or that the recipient's email server does not all the attachment file types.
The sender must be aware of the attachments allowed by the recipient's email server or email service provider to resolve this issue.
The sender must remain within the size constraint set by the recipient's email server or email service provider.
It is also essential that the sender only sends file types as attachments allowed by the recipient.
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